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Category: Navigation

  • Best Chartplotter for Coastal Cruising: Our Top Picks

    A chartplotter is the navigational center of any coastal cruising setup. It integrates your GPS position, electronic charts, AIS traffic, depth data, and increasingly your VHF radio and autopilot — all on a single screen at the helm. Choosing the right one depends on screen size, chart ecosystem, network compatibility, and budget. This guide covers the top chartplotters available in 2026 for coastal cruising vessels and cuts through the feature lists to what actually matters on the water.

    Quick Picks: Best overall — Garmin GPSMAP 923xsv. Best budget — Garmin ECHOMAP UHD2 93sv. Best for Raymarine users — Raymarine Axiom+ 9. Best large-screen — Garmin GPSMAP 1243xsv.

    Comparison Table: Top Chartplotters for Coastal Cruising 2026

    Model Screen Built-in Sonar NMEA 2000 Best For
    Garmin GPSMAP 923xsv 9″ touchscreen Yes (GT52HW-TM) Yes Best Overall
    Garmin GPSMAP 1243xsv 12″ touchscreen Yes Yes Large Helm Stations
    Raymarine Axiom+ 9 9″ touchscreen Yes (RealVision 3D) Yes (SeaTalkng) Raymarine Ecosystems
    Lowrance HDS-9 Live 9″ touchscreen Yes (Active Imaging) Yes Fishing/Cruising Combo
    Garmin ECHOMAP UHD2 93sv 9″ touchscreen Yes No Best Value

    Full Reviews

    #1 — Garmin GPSMAP 923xsv: Best Overall Chartplotter for Coastal Cruising

    The Garmin GPSMAP 923xsv is the top recommendation for most coastal cruising sailors adding or upgrading a chartplotter in 2026. It combines a bright, responsive 9-inch touchscreen with full NMEA 2000 network integration, built-in sonar (with the included GT52HW-TM transducer), and Garmin’s Navionics+ chart subscription — all in a package that integrates tightly with Garmin’s broader ecosystem of VHF radios, autopilots, and AIS units.

    The screen is outstanding — 800 nits of brightness is readable in direct tropical sunlight, which matters more than any spec on the datasheet once you’re actually at the helm in the afternoon. The capacitive touchscreen responds accurately with wet hands and gloves, avoiding the frustration of resistive screens that require precise pressure.

    NMEA 2000 connectivity means the 923xsv pulls depth, wind, speed, and AIS data from your vessel’s instrument network without additional wiring. A connected Garmin VHF (such as the VHF 215i reviewed in our VHF Radio Reviews guide) displays DSC distress calls and AIS targets on the chartplotter screen with full chartplotter control.

    The Navionics+ subscription provides detailed coastal charts for U.S. waters with Community Edits (crowd-sourced depth corrections), SonarChart Live (real-time depth charting with your transducer), and Dock-to-dock autorouting. For coastal cruising, this is the most practically useful chart package available.

    Amazon link: Garmin GPSMAP 923xsv on Amazon

    Pros: Best-in-class screen brightness, full N2K integration, Garmin ecosystem depth, Navionics+ included
    Cons: Premium price; Garmin ecosystem lock-in
    Best for: New installs or full electronics upgrades on cruising sailboats and powerboats

    #2 — Garmin GPSMAP 1243xsv: Best Large-Screen Option

    If your helm station has room for a 12-inch display and your budget supports it, the GPSMAP 1243xsv is the GPSMAP 923xsv scaled up. The larger screen makes split-screen operation genuinely useful — chart on one side, sonar or radar overlay on the other — and the additional real estate is meaningful for route planning at anchor when you want a detailed view of tomorrow’s passage.

    Performance is identical to the 923xsv. Same brightness, same N2K integration, same Navionics+ subscription, same Garmin ecosystem compatibility. The choice between 9″ and 12″ is purely about helm layout and budget.

    Amazon link: Garmin GPSMAP 1243xsv on Amazon

    Pros: Large screen ideal for split-screen operation, all GPSMAP 923xsv features
    Cons: Higher cost, requires larger helm cutout
    Best for: Larger vessels with purpose-built nav stations; sailors who do significant passage planning at anchor

    #3 — Raymarine Axiom+ 9: Best for Raymarine Ecosystems

    Raymarine’s Axiom+ 9 is the direct competitor to the Garmin GPSMAP 923xsv, and it’s a strong unit in its own right — particularly for sailors already invested in Raymarine autopilots, instruments, or radar. The Axiom+ runs Raymarine’s LightHouse 4 OS, which is clean and intuitive, and integrates with Raymarine’s SeaTalkng network (which is NMEA 2000-compatible).

    The standout hardware feature is RealVision 3D sonar — Raymarine’s proprietary side-scan and down-scan sonar technology that produces impressively detailed bottom images for anchoring and fishing. For coastal cruising where anchoring in unfamiliar spots is regular, the ability to see bottom structure in 3D before dropping the hook is genuinely useful.

    Lighthouse Charts (Navionics-based) are Raymarine’s standard chart package and perform comparably to Navionics+ on Garmin. The Axiom+ also supports C-MAP charts if you prefer that ecosystem.

    Amazon link: Raymarine Axiom+ 9 on Amazon

    Pros: RealVision 3D sonar, strong Raymarine ecosystem integration, clean UI
    Cons: Slightly less bright than Garmin GPSMAP; ecosystem lock-in
    Best for: Sailors with existing Raymarine autopilots or instruments

    #4 — Lowrance HDS-9 Live: Best for Fishing-Cruising Combination

    The Lowrance HDS-9 Live occupies an interesting position — it’s primarily a fishing electronics platform that happens to be a very capable chartplotter. For powerboaters who fish and cruise in equal measure, the HDS-9 Live’s Active Imaging sonar (side-scan, down-scan, and 2D) combined with full NMEA 2000 integration and C-MAP charts makes it the best dual-purpose unit available.

    For pure sailors focused on coastal cruising rather than fishing, the HDS-9 Live is a capable but less compelling choice than the Garmin or Raymarine alternatives — it’s optimized slightly toward the fishing use case, and Lowrance’s autopilot integration is narrower than Garmin’s or Raymarine’s.

    Amazon link: Lowrance HDS-9 Live on Amazon

    Pros: Outstanding fishing sonar, C-MAP charts, full NMEA 2000
    Cons: Less compelling for pure cruising; Lowrance ecosystem is narrower
    Best for: Powerboaters who fish and cruise; anglers who also make coastal passages

    #5 — Garmin ECHOMAP UHD2 93sv: Best Budget Chartplotter

    The ECHOMAP UHD2 93sv is Garmin’s value-tier 9-inch chartplotter and represents excellent performance per dollar for sailors who want a capable Garmin unit without paying for full NMEA 2000 network integration. It includes built-in sonar, a bright touchscreen, and Navionics+ charts — the essentials — at a meaningfully lower price than the GPSMAP series.

    The key trade-off is the lack of NMEA 2000 networking. The ECHOMAP UHD2 can share data with some Garmin instruments via proprietary Garmin Marine Network, but it won’t integrate seamlessly into a multi-manufacturer NMEA 2000 setup. For a simple installation with primarily Garmin components, this is a minor limitation. For a complex mixed-brand network, it’s a real constraint.

    Amazon link: Garmin ECHOMAP UHD2 93sv on Amazon

    Pros: Excellent value, bright screen, Navionics+ included, Garmin reliability
    Cons: No full NMEA 2000; Garmin Marine Network only for instrument integration
    Best for: Budget-conscious sailors installing a standalone chartplotter without complex instrument networks

    What to Look for When Buying a Chartplotter

    Screen Size and Brightness

    Screen size is about readability at the helm — a 7-inch screen is fine for a tiller-steered dinghy cruiser, while a 40-foot sloop with a cockpit helm benefits from a 9- or 12-inch display. More important than size is brightness: 800+ nits is the threshold for comfortable daytime readability in direct sun. Units below 600 nits require shade or squinting in bright conditions.

    Chart Ecosystem

    Navionics and C-MAP are the dominant chart providers. Both produce high-quality coastal charts for U.S. waters. Navionics has an edge in community-sourced depth corrections (particularly valuable in areas with shifting sandbars and unmarked shoals). C-MAP’s 4D charts include tidal prediction and current data overlaid on the chart, which some coastal cruisers find more useful for passage planning. Either is an excellent choice — pick based on which chartplotter you prefer and which chart subscription structure fits your budget.

    NMEA 2000 vs. Proprietary Networking

    NMEA 2000 is the industry standard for marine electronics networking. A chartplotter with full N2K support integrates seamlessly with instruments, VHF radios, autopilots, and AIS units from any manufacturer. Proprietary networks (Garmin Marine Network, Raymarine SeaTalkng) work best within their own ecosystems. If you’re building a multi-brand setup or upgrading incrementally over time, N2K compatibility in your chartplotter is worth the additional cost.

    Built-in Sonar

    Most modern chartplotters include sonar capability. For coastal cruising, the practical value of built-in sonar is real-time depth confirmation in anchorages, shoal detection, and the ability to build SonarChart overlays on your charts. You’ll need a compatible transducer — most come bundled or are sold as a package. Through-hull transducers provide the cleanest signal; transom-mount transducers are easier to install on most vessels.

    Autopilot Integration

    For coastal cruising under sail, autopilot integration with your chartplotter enables route-following — the autopilot steers the boat along your planned route without manual input. This is one of the most valuable capabilities for short-handed sailing. Garmin, Raymarine, and B&G all offer tightly integrated autopilot-chartplotter pairings. Verify compatibility between your planned chartplotter and your existing or planned autopilot before purchasing.

    Related Navigation Guides

    Frequently Asked Questions

    Do I need a chartplotter if I have navigation apps on my iPad?

    Tablet-based navigation apps (Navionics, iNavX, Garmin ActiveCaptain) are capable and many coastal cruisers rely on them. The limitations: tablets aren’t marine-rated (most fail in sustained saltwater spray), they don’t integrate with NMEA 2000 instrument networks without additional adapters, and screen brightness is typically lower than dedicated chartplotters. A dedicated chartplotter is the more reliable and integrated solution for primary navigation; a tablet makes an excellent backup.

    What charts do I need for U.S. coastal cruising?

    NOAA charts (now free to download) are the official reference. Navionics+ and C-MAP provide these charts in a more navigable format with additional data layers. For coastal U.S. waters, either commercial chart subscription is comprehensive. NOAA raster charts are available as free overlays on many platforms including Navionics as a reference layer.

    How often should I update my chartplotter charts?

    Navionics+ and C-MAP subscriptions include continuous updates delivered over Wi-Fi — your charts are current as long as your subscription is active. Annual subscriptions run $50–$150 depending on region. Given that shoaling, channel changes, and new hazards occur regularly in many coastal areas, keeping charts current is worth the subscription cost.

    Can I connect my VHF radio to my chartplotter?

    Yes, if both are NMEA 2000-compatible. Connecting your DSC-capable VHF to an N2K chartplotter enables the chartplotter to display DSC distress call information and plot the position of calling vessels directly on your chart. Garmin’s VHF 215i integrates with Garmin chartplotters over N2K for full chartplotter-initiated calling — see our VHF Radio Reviews for details.

    Further Reading

  • VHF Radio Reviews 2026: Tested and Ranked

    If you’re shopping for a marine VHF radio in 2026, the options can feel overwhelming. Fixed-mount or handheld? DSC-enabled? AIS receiver built in? We’ve done the legwork — testing and ranking the top VHF radios currently on the market so you can make an informed decision before you leave the dock.

    This review covers fixed-mount and handheld models across price ranges, from budget-friendly handhelds for day sailors to full-featured fixed-mount units with integrated AIS for offshore passage makers. Every radio on this list is USCG-compliant, DSC-capable, and available now.

    Quick Summary: Our top overall pick is the Standard Horizon GX2400 for fixed-mount installs and the Icom IC-M94D for handheld use. Both offer AIS receive capability, loud hailers, and rock-solid DSC performance at reasonable prices.

    Comparison Table: Top VHF Radios in 2026

    Radio Type Wattage AIS Receive Best For Price Range
    Standard Horizon GX2400 Fixed 25W ✓ Yes Most Boaters $$$
    Icom IC-M605 Fixed 25W ✓ Yes Offshore Cruisers $$$
    Garmin VHF 215i Fixed 25W ✓ Yes Garmin Ecosystems $$$
    Standard Horizon GX1850 Fixed 25W ✗ No Budget Fixed-Mount $$
    Icom IC-M94D Handheld 6W ✓ Yes Best Handheld $$$
    Standard Horizon HX890 Handheld 6W ✗ No Budget Handheld $$

    Fixed-Mount VHF Radio Reviews

    #1 — Standard Horizon GX2400: Best Overall Fixed-Mount

    The Standard Horizon GX2400 is our top-ranked fixed-mount VHF radio for 2026. It delivers everything a coastal cruiser needs — 25W output, Class D DSC with built-in GPS, AIS receive capability, a 30W hailer/intercom, and Bluetooth audio — in a package that’s competitively priced and easy to install.

    What sets the GX2400 apart from previous Standard Horizon models is the dual-channel AIS display. You can monitor AIS targets directly on the radio’s screen without needing a separate chartplotter connected — a meaningful safety upgrade for single-handed sailors and coastal passages where chartplotter screen real estate is at a premium.

    Audio performance is excellent. The 7W speaker is among the loudest in its class, and hailer quality is clean and projectable at range. The noise-canceling mic handles wind and engine noise well.

    Installation is straightforward. The GX2400 supports NMEA 2000 connectivity, so it drops into a modern electronics bus without a separate GPS puck — just wire it to your N2K backbone and it pulls position data from your existing network.

    Fisheries Supply link: Standard Horizon GX2400 at Fisheries Supply

    Pros: AIS receive, N2K compatible, loud hailer, Bluetooth, excellent audio
    Cons: No AIS transmit (requires separate transponder for full AIS)
    Best for: Coastal and offshore cruisers who want a complete DSC/AIS radio in one unit

    #2 — Icom IC-M605: Best for Offshore Cruisers

    Icom has long been the benchmark for marine radio build quality, and the IC-M605 continues that tradition. This is a 25W fixed-mount with Class D DSC, integrated GPS, AIS receive, and Icom’s Active Noise Canceling (ANC) technology on both the speaker and mic — a feature that makes a real difference in noisy cockpit environments.

    The M605 also supports Icom’s Command Mic and RS-M500 remote station, making it well-suited for sailboats where you want radio access at the helm and the companionway without running a full second radio. The remote microphone option is something Standard Horizon doesn’t match at this price point.

    Menu navigation is clean and intuitive. Icom’s button layout has been refined over multiple generations, and experienced VHF users will feel comfortable within minutes. The color display is bright and readable in direct sunlight — a more significant advantage than it sounds for a GPS-equipped DSC radio.

    Fisheries Supply link: Icom IC-M605 at Fisheries Supply

    Pros: Excellent build quality, ANC technology, remote mic support, bright display
    Cons: Slightly higher price than GX2400; no Bluetooth
    Best for: Offshore passage makers and liveaboards who prioritize durability and remote station capability

    #3 — Garmin VHF 215i: Best for Garmin Chartplotter Users

    If your helm is built around a Garmin chartplotter, the VHF 215i integrates more seamlessly than any competitor. Paired via NMEA 2000, it displays DSC distress calls and AIS targets directly on your Garmin chart, and you can initiate calls and access DSC functions from the chartplotter touchscreen without touching the radio. For a Garmin ecosystem, it’s a genuine quality-of-life upgrade.

    Standalone performance is competitive — 25W output, Class D DSC, integrated GPS, and AIS receive. Audio is good but doesn’t quite match the GX2400’s raw volume. The display is readable, though smaller than Icom’s M605.

    Outside a Garmin setup, the VHF 215i loses its biggest differentiator. It’s still a capable radio, but at its price you’d likely do better with the GX2400 or M605 if you’re not running Garmin charts.

    Fisheries Supply link: Garmin VHF 215i at Fisheries Supply

    Pros: Tight Garmin ecosystem integration, AIS receive, chartplotter control
    Cons: Loses its edge outside a Garmin setup; smaller display than competitors
    Best for: Boaters running Garmin chartplotters who want full chartplotter-radio integration

    #4 — Standard Horizon GX1850: Best Budget Fixed-Mount

    The GX1850 is the entry point for fixed-mount VHF radios that still take safety seriously. It’s a 25W Class D DSC radio with an integrated GPS — the core requirements for proper distress calling — at a price well below the AIS-capable models above.

    What you give up at this price: no AIS receiver, no Bluetooth, no hailer, and a smaller display. What you get: Standard Horizon reliability, loud audio, and full DSC functionality. For day sailors, weekend cruisers, and powerboat owners who want a capable primary radio without paying for features they won’t use, the GX1850 is a smart buy.

    Installation is simple — NMEA 0183 compatible, with an external GPS input if you want to pull position from your chartplotter instead of the internal GPS.

    Fisheries Supply link: Standard Horizon GX1850 at Fisheries Supply

    Pros: Excellent value, reliable DSC, loud speaker, simple installation
    Cons: No AIS, no hailer, basic display
    Best for: Day sailors and weekend cruisers who want a solid primary radio on a budget

    Handheld VHF Radio Reviews

    #5 — Icom IC-M94D: Best Handheld VHF Radio

    The IC-M94D is the most capable handheld VHF radio available in 2026. The headline feature is built-in AIS receive — rare in a handheld — combined with a 6W output, Class D DSC with GPS, and IPX8 waterproofing (submersible to 1.5m for 30 minutes). It’s a meaningful safety upgrade over standard handhelds for coastal sailors, kayakers, and anyone who spends time on the water without a fixed-mount radio as backup.

    The AIS display is practical, not just a checkbox. The M94D shows nearby AIS targets with range and bearing on its screen, giving you real traffic awareness when anchoring in a shipping lane or navigating a busy harbor entrance in reduced visibility.

    Battery life is solid — rated for approximately 7 hours of typical use. The battery charges via USB-C, which is a welcome upgrade from proprietary charging connectors on older models.

    Fisheries Supply link: Icom IC-M94D at Fisheries Supply

    Pros: AIS receive in a handheld, 6W output, IPX8 waterproof, USB-C charging, GPS
    Cons: Premium price for a handheld; AIS transmit requires a separate transponder
    Best for: Coastal sailors, cruisers, and anyone using a handheld as a primary or backup radio who wants AIS capability

    #6 — Standard Horizon HX890: Best Budget Handheld

    The HX890 is the handheld that outperforms its price tag. It’s a 6W Class D DSC radio with GPS, IPX7 waterproofing, and a bright color display. No AIS receive, but otherwise it covers every practical requirement for a coastal handheld radio.

    Standard Horizon’s HX890 is notably loud — the speaker output punches above what you’d expect from a handheld, which matters when you’re trying to hear a response while standing on deck in a breeze. The Dual Watch and Tri Watch functions work cleanly, and the controls are well-spaced for use in gloves.

    It’s a particularly strong choice as a second radio — carried by crew as a backup to your fixed-mount, stored in your ditch bag, or kept aboard a dinghy.

    Fisheries Supply link: Standard Horizon HX890 at Fisheries Supply

    Pros: Strong value, loud speaker, GPS, good waterproofing, glove-friendly controls
    Cons: No AIS, no USB-C charging
    Best for: Backup radio, dinghy use, day sailors who want a capable handheld without paying for AIS

    What to Look for When Buying a VHF Radio in 2026

    DSC Is Non-Negotiable

    Digital Selective Calling (DSC) is the standard emergency protocol for marine VHF radios. A DSC-equipped radio with a connected GPS can transmit your exact position to the Coast Guard with a single button press. Every radio on this list supports DSC Class D — the minimum standard for coastal use. Do not buy a radio without DSC.

    Fixed-Mount vs. Handheld

    Fixed-mount radios transmit at 25W vs. 6W for handhelds — that’s a significant range difference. For any vessel with a permanent helm station, a fixed-mount radio is your primary safety communication tool. Handhelds serve as backups, dinghy radios, or primary radios for kayaks and small day boats where a fixed install isn’t practical. Most cruising sailors carry both.

    AIS Receive vs. AIS Transponder

    AIS receive-capable radios (GX2400, M605, VHF 215i, IC-M94D) can see other vessels transmitting AIS signals. AIS transponders both receive and broadcast your own vessel’s data. For collision avoidance, receive capability alone is useful — you can see commercial traffic. But other vessels can’t see you unless you have a transponder. For offshore passages and high-traffic areas, a Class B AIS transponder is worth considering as a separate installation.

    NMEA 2000 vs. NMEA 0183

    Modern chartplotter installations are almost entirely NMEA 2000. If your boat has an N2K backbone, buy a radio with N2K support (all four fixed-mount radios on this list qualify). NMEA 0183 is the older standard — still functional, but requires adapters and individual wiring runs in a modern electronics setup.

    Hailer/Intercom

    A built-in hailer uses your VHF antenna to project your voice over a speaker — useful for hailing other vessels at close range or communicating from helm to foredeck on a larger boat. The GX2400’s 30W hailer is the standout at this price point.

    Internal Links: Related VHF Navigation Guides

    Frequently Asked Questions

    Do I need a license to operate a VHF radio in the U.S.?

    For recreational vessels operating exclusively in U.S. waters, no FCC ship station license is required. However, if you travel to foreign ports or make or receive international communications, you need an FCC Ship Station License and each operator needs a Restricted Radiotelephone Operator Permit (RP). The RP is obtained via a simple FCC exam.

    What channel should a VHF radio be set to?

    Channel 16 (156.800 MHz) is the international distress, safety, and calling channel. FCC regulations require vessels equipped with VHF radios to maintain a watch on Channel 16 whenever the radio is on. Most modern radios have a dedicated Channel 16 button for instant access.

    How far can a VHF radio transmit?

    VHF marine radio is line-of-sight. A fixed-mount 25W radio with a masthead antenna on a sailboat can typically communicate 20–40 miles with another vessel or a Coast Guard station. A handheld at 6W expects 5–10 miles of useful range. Terrain, antenna height, and atmospheric conditions all affect real-world performance.

    What’s the difference between Class D and Class H DSC?

    Class D DSC is the standard for recreational fixed-mount radios — it handles distress calling and individual/group calls. Class H is a simpler designation for handhelds. Both are USCG-compliant for coastal use. If you see “Class D” on a fixed-mount radio, that’s the correct spec for coastal cruising.

    Can a VHF radio replace an EPIRB?

    No. A VHF radio requires another vessel or station to be listening on Channel 16 within line-of-sight range. An EPIRB transmits via satellite and is detected globally by COSPAS-SARSAT regardless of who is nearby. Both serve different, complementary roles. For offshore use, carry both.

    Further Reading

  • Best VHF Radio for Coastal Cruising in 2026

    A marine VHF radio is the single most important piece of safety electronics on a coastal cruising boat. It’s how you call for help, monitor weather, talk to bridges and marinas, and coordinate with other vessels. If only one piece of electronics survives a catastrophic failure, you want it to be your VHF.

    But not all VHF radios are created equal. The best VHF radio for coastal cruising needs reliable Digital Selective Calling (DSC), enough transmit power to reach the Coast Guard from offshore, and ideally a built-in GPS so a single button press sends your exact position to rescue services. Some models add AIS receivers, chart plotter integration, and hailer functions that make a real difference on extended passages.

    I’ve reviewed the top fixed-mount and handheld models available at Fisheries Supply to help you choose the right radio for your boat and budget.

    Quick Comparison: Best VHF Radios for Coastal Cruising

    Model Type Power DSC GPS AIS Best For
    Standard Horizon GX2400 Fixed mount 25W Class D Built-in Receiver Best overall
    Icom IC-M510 Fixed mount 25W Class D Built-in Receiver Icom loyalists
    Standard Horizon GX1850 Fixed mount 25W Class D Built-in No Best value
    Garmin VHF 215 Fixed mount 25W Class D External No Garmin chartplotter users
    Standard Horizon HX870 Handheld 6W Class D Built-in No Best handheld backup
    Icom IC-M94D Handheld 5W Class D Built-in No Crew handheld

    The Best VHF Radios for Coastal Cruising in 2026

    1. Standard Horizon GX2400 — Best Overall Fixed-Mount VHF

    The Standard Horizon GX2400 has earned its reputation as the go-to fixed-mount VHF for coastal cruisers. It packs everything you need into a compact, waterproof package: 25 watts of transmit power, a built-in GPS receiver, a Class D DSC controller, and an AIS receiver that displays nearby vessel traffic directly on the radio’s screen.

    The AIS receiver is the feature that sets the GX2400 apart from radios in the same price range. You can see the names, positions, course, and speed of AIS-equipped vessels within range — no separate AIS display needed. For coastal passages where commercial traffic is a concern, this is genuinely useful situational awareness.

    The built-in GPS means your DSC distress call automatically includes your position without any external connection. In an emergency, you press and hold the red distress button for five seconds and the Coast Guard receives your MMSI number, vessel name, and exact GPS coordinates — all without touching anything else. That’s the right way to build a safety system.

    Other practical features: the GX2400 has a command microphone port for helm-to-helm operation, dual-watch and tri-watch scanning, a 30-watt hailer/foghorn function, and a NOAA weather alert receiver. The display is large and readable in bright sunlight. The menus are logical without requiring the manual to navigate.

    At around $350–$400 street price, the GX2400 represents excellent value for what it delivers. It’s my top recommendation for coastal cruisers who want one radio that handles navigation awareness, safety calling, and weather monitoring without a second box.

    • Transmit power: 25W / 1W selectable
    • DSC class: Class D with built-in GPS
    • AIS: Receive-only (displays up to 100 targets)
    • Waterproofing: IPX8 (submersible to 1.5m)
    • Hailer: 30W
    • Approximate price: $350–$400

    2. Icom IC-M510 — Best Fixed-Mount for Icom Users

    The Icom IC-M510 is the Standard Horizon GX2400’s closest competitor and a radio that many cruisers prefer for its build quality and interface clarity. Like the GX2400, it delivers 25W output, built-in GPS, Class D DSC, and an AIS receiver.

    What distinguishes the M510 is the display quality. The 3.7-inch color display is bright, high-contrast, and renders AIS targets cleanly with vessel name overlays. If you’re glancing at the radio from the helm in afternoon glare, the M510’s display is easier to read quickly than most competitors.

    Icom’s CommandMic IV compatibility is a meaningful feature for boats with multiple helms. You can install a second control head at the cockpit or flybridge and operate the radio fully from either location. The M510 also supports NMEA 2000 and NMEA 0183 connectivity, making it easy to share GPS position data with other electronics on the network.

    The M510 is slightly more expensive than the GX2400 — typically $380–$430 — but the premium is justified by the display quality and the depth of network integration. For a boat already running an Icom electronics suite, it’s the natural choice.

    • Transmit power: 25W / 1W selectable
    • DSC class: Class D with built-in GPS
    • AIS: Receive-only
    • Display: 3.7″ color
    • Connectivity: NMEA 0183, NMEA 2000
    • Approximate price: $380–$430

    3. Standard Horizon GX1850 — Best Value Fixed-Mount VHF

    If you need a dependable coastal VHF without the AIS receiver, the Standard Horizon GX1850 delivers 25W, built-in GPS, and Class D DSC at a price that’s roughly $100 less than the GX2400. For day sailors, powerboaters, and coastal cruisers who aren’t frequently navigating busy commercial shipping lanes, it’s the most sensible choice in the lineup.

    The GX1850 shares the same DSC architecture as its bigger siblings. Your distress call still transmits GPS coordinates automatically. NOAA weather channels and alerts are included. The hailer function is 25 watts. The display is clear and the interface is familiar to anyone who has used a Standard Horizon radio before.

    What you give up compared to the GX2400 is AIS receive capability and the slightly higher hailer output. For most coastal cruisers who aren’t tracking commercial vessel traffic on their radio screen, that’s a trade worth making to save $100.

    The GX1850 also makes an excellent second radio — a flybridge or companion unit where the primary AIS display is handled by a chartplotter elsewhere on the network.

    • Transmit power: 25W / 1W selectable
    • DSC class: Class D with built-in GPS
    • AIS: None
    • Waterproofing: IPX8
    • Hailer: 25W
    • Approximate price: $240–$270

    4. Garmin VHF 215 — Best for Garmin Chartplotter Integration

    The Garmin VHF 215 is purpose-built for boats running a Garmin chartplotter at the helm. Via NMEA 2000 and Garmin’s proprietary network, the VHF 215 integrates tightly with Garmin displays: you can initiate DSC calls, monitor AIS targets, and see radio status from your chartplotter screen, with the chartplotter’s GPS feeding position data to the radio automatically.

    The 215 is a 25W radio with Class D DSC. It relies on an external GPS source (typically the chartplotter network) rather than a built-in GPS receiver. That’s fine in a tight Garmin system, but it means if the chartplotter fails, the radio loses position data for DSC calls. For offshore passages, I’d favor a radio with its own GPS as a backup.

    If your boat is a Garmin shop and you value deep integration over standalone redundancy, the VHF 215 is an elegant solution. The display and menus feel consistent with Garmin’s other marine products, and the network integration genuinely simplifies the helm.

    • Transmit power: 25W / 1W selectable
    • DSC class: Class D
    • GPS: External (NMEA 2000 or Garmin network)
    • Chartplotter integration: Full Garmin GRID / NMEA 2000
    • Approximate price: $220–$260

    5. Standard Horizon HX870 — Best Handheld VHF for Coastal Cruising

    Every coastal cruising boat should carry at least one handheld VHF in addition to the fixed-mount unit. If the boat loses power, if someone goes overboard, if the primary radio fails — the handheld is your last line of communication. The Standard Horizon HX870 is the best handheld for this role.

    The HX870 transmits at 6 watts — the maximum allowed for handheld VHFs — which gives you a useful range of 5–8 miles depending on antenna height. More importantly, it has built-in GPS and Class D DSC, meaning it can transmit a full position-tagged distress call independently of any other electronics on the boat. In a man-overboard situation, a crew member in the water with an HX870 can send their exact GPS coordinates to rescuers.

    The radio is floating and submersible to IPX8 standards (1.5 meters for 30 minutes). The battery life is exceptional — Standard Horizon claims up to 12 hours of typical use per charge. The keypad is large and operable with gloves on, which matters when conditions are deteriorating.

    The HX870 also has a Bluetooth option for wireless communication with compatible headsets, useful for offshore passages where continuous radio monitoring is practical. It’s a well-rounded backup that earns its spot in the ditch bag.

    • Transmit power: 6W / 5W / 1W selectable
    • DSC class: Class D with built-in GPS
    • Waterproofing: IPX8, floating
    • Battery life: Up to 12 hours
    • Bluetooth: Yes
    • Approximate price: $200–$230

    6. Icom IC-M94D — Best Crew Handheld

    For boats that want two handhelds — one for the skipper’s ditch bag and one for crew use — the Icom IC-M94D is a solid, cost-effective option. It transmits at 5 watts, carries DSC with built-in GPS, and has Icom’s trademark build quality and button layout.

    The M94D is slightly smaller than the HX870 and fits more easily in a pocket or PFD pouch. Battery life runs around 8–10 hours, slightly less than the Standard Horizon but still practical for a full day offshore. It’s IPX8 rated and floating.

    At around $150–$175, the M94D is priced to be the second or third handheld aboard rather than the primary backup. For boats with crew who need their own radio access, it’s an affordable way to equip multiple people.

    • Transmit power: 5W / 0.5W selectable
    • DSC class: Class D with built-in GPS
    • Waterproofing: IPX8, floating
    • Battery life: ~8–10 hours
    • Approximate price: $150–$175

    What to Look for in a VHF Radio for Coastal Cruising

    DSC with Built-in GPS Is Non-Negotiable

    All modern fixed-mount VHF radios include Digital Selective Calling (DSC), but not all include their own GPS. DSC is the automated distress calling system that transmits your MMSI number and, if GPS is available, your position when you press the distress button. A radio with built-in GPS sends your coordinates automatically. A radio that relies on an external GPS source — from a chartplotter or separate receiver — only sends position data if that external connection is live and working. In an emergency, single points of failure kill people. Buy a radio with its own GPS.

    Transmit Power: 25 Watts for Fixed Mount

    All fixed-mount VHF radios sold for marine use in the US transmit at 25 watts on high power, which gives a line-of-sight range of roughly 20–25 miles depending on antenna height. This is a regulated maximum — no legal marine VHF transmits more than 25W. What varies is output quality, antenna connector type, and low-power (1W) mode. Most radios offer 1W/25W switching; use low power for short-range marina communication and full power for safety calls and longer-range communication.

    AIS Receiver: Worth It If You’re in Commercial Traffic

    An AIS receiver built into your VHF radio shows nearby AIS-equipped vessels — their name, position, course, and speed — on the radio’s display. This is passive situational awareness that costs nothing to operate and requires no subscription. For coastal passages near commercial shipping, this can be genuinely valuable: you’ll see a freighter before you see it on radar. For day sailing on inland bays, it’s a nice-to-have. The AIS-equipped radios in this guide (GX2400, IC-M510) cost roughly $100–$150 more than their non-AIS equivalents; judge whether that’s worth it for your sailing area.

    Register Your MMSI Before You Leave the Dock

    DSC is useless without a registered MMSI number. The Maritime Mobile Service Identity is a nine-digit number that identifies your vessel in the DSC system. When you press the distress button, that MMSI number goes to the Coast Guard, who cross-references it against the MMSI database to identify your boat. Without registration, they get an anonymous distress signal with no vessel name or owner contact information.

    MMSI registration for recreational vessels is free through BoatUS or Sea Tow (both offer free registration, no membership required). You program the number into your radio once during setup. It stays there until you change radios or sell the boat — at which point the new owner must re-register the MMSI in their name.

    Antenna Matters More Than the Radio

    A 25-watt radio connected to a poor antenna performs worse than a 25-watt radio connected to a quality antenna. For coastal cruising, a 8 dBi gain antenna mounted as high as practical on your mast will dramatically extend your effective range compared to the stub antennas that come with some installs. The coax cable connecting the antenna to the radio also matters: use low-loss RG-8X or LMR-400 coax, and keep runs as short as practical. Don’t let a great radio underperform because of a poor antenna installation.

    Waterproofing Standards

    Look for IPX7 or IPX8 waterproofing on any radio used in a coastal cruising application. IPX7 means submersible to 1 meter for 30 minutes; IPX8 means submersible to 1.5 meters for 30 minutes. For fixed-mount radios in a protected helm station, IPX7 is typically adequate. For handhelds and any radio exposed to heavy spray or potential immersion, IPX8 is the better choice. All the radios in this guide are rated IPX8.

    Fixed Mount vs. Handheld: Do You Need Both?

    Yes. A fixed-mount radio is your primary communication device: it has more power, a better antenna connection, and is always on and monitoring Channel 16. A handheld is your backup and your go-bag radio. If you need to abandon ship, the handheld comes with you. If a crew member goes overboard, they take the handheld. If the boat loses power, the handheld keeps you connected to rescue services.

    The combination of a Standard Horizon GX2400 at the helm and an HX870 in the ditch bag covers both scenarios and gives you two independent DSC/GPS-capable radios aboard. That’s the right setup for a coastal cruising vessel.

    Frequently Asked Questions

    Do I need a license to operate a marine VHF radio?

    For recreational vessels operating domestically in US waters, you do not need a ship station license or an operator’s permit to use a marine VHF radio. However, if you travel to foreign ports or operate a vessel for hire, a Ship Station License (from the FCC) and a Restricted Radiotelephone Operator Permit are required. MMSI registration is separate from licensing and is always required for DSC functionality.

    What channel should I monitor?

    Channel 16 is the international distress and calling channel and is monitored by the US Coast Guard 24/7. You’re required by law to monitor Channel 16 whenever your radio is on and you’re not communicating on another channel. Most modern radios have dual-watch or tri-watch modes that monitor Channel 16 automatically while you’re on a working channel.

    How far can a VHF radio reach?

    VHF radio is line-of-sight. The practical range depends on antenna height at both ends. A fixed-mount radio with a masthead antenna on a 40-foot sailboat can reach the Coast Guard (typically using shore-based antennas at significant height) at 20–40 miles. A handheld radio held at deck level might reach 3–8 miles to a similarly positioned antenna. Height is everything: the higher your antenna, the farther you reach.

    Can I use my VHF radio to call other boats directly?

    Yes. You can hail another vessel on Channel 16 and then switch to a working channel (9, 68, 69, 71, 72, or 78A are commonly used for recreational boat-to-boat communications) to continue the conversation. DSC also allows direct vessel-to-vessel calls to a specific MMSI number.

    How often should I test my radio?

    Test your radio before each offshore passage. Use the self-test function and verify DSC operation. You can request a DSC radio check from another vessel or marina on Channel 16. Do not activate the DSC distress function as a test — that triggers a real Coast Guard response. Some Coast Guard stations offer radio check services on Channel 22A; call on 16 first to ask.

    Our Recommendation

    For coastal cruisers who want the best overall setup: install the Standard Horizon GX2400 as your primary fixed-mount and keep an HX870 handheld in your ditch bag. You’ll have 25W fixed-mount output with AIS awareness at the helm and an independent 6W DSC/GPS-capable handheld that comes with you if the boat doesn’t. That’s a complete VHF system for under $600.

    If budget is the primary driver, the GX1850 plus the HX870 gets you the same safety capability (25W fixed, 6W handheld, both with DSC and GPS) for about $100 less, just without the AIS receiver. For most coastal sailing areas, that’s a perfectly sound choice.

    See Also: VHF Radio Antenna Selection Guide for Coastal Cruisers — choosing the right antenna is just as important as the radio itself. And if you’re new to operating marine VHF, our step-by-step VHF programming guide walks you through setup from scratch. For a complete look at required safety electronics, see our Coast Guard required safety equipment guide.

    Further Reading

  • How to Program a Marine VHF Radio (Step-by-Step)






    Most VHF radios come out of the box without an MMSI programmed, without DSC configured, and without a channel scan list set up. They’ll transmit on Channel 16 — but they won’t send a proper DSC distress signal, they won’t automatically include your position in an emergency, and they won’t alert you to an incoming DSC call. A radio that’s powered on but not properly programmed is a partially functional piece of safety equipment.

    Programming a VHF radio takes about 20 minutes. Here’s how to do it correctly.

    Step 1: Get Your MMSI Before You Program Anything

    The MMSI (Maritime Mobile Service Identity) is a 9-digit number permanently assigned to your vessel. It’s what the Coast Guard uses to identify you when your radio sends a DSC distress signal. Without a registered MMSI programmed into the radio, a DSC distress call transmits as an anonymous alert — the Coast Guard knows someone is in distress, but not who or where.

    In the US, recreational vessels operating domestically can get a free MMSI through:

    • BoatUS (boatus.com/mmsi) — free for BoatUS members and non-members
    • Sea Tow (seatow.com/boating-safety/mmsi) — free registration service

    Both services register your MMSI with the FCC database so rescue authorities can look up your vessel information from any DSC signal. The process takes about 5 minutes online. You’ll need your vessel name, documentation number or state registration number, and emergency contact information.

    If you plan to take your vessel outside US waters, you’ll also need an FCC Ship Station License and a Restricted Radiotelephone Operator Permit. For domestic coastal cruising, the free MMSI registration covers you.

    Write the MMSI down before you go near the radio. On most units, you can only enter it once.

    Step 2: Program the MMSI into Your Radio

    The exact menu path varies by manufacturer, but the process is consistent across DSC-capable radios:

    1. Power on the radio and access the main menu
    2. Navigate to DSC or DSC Setup
    3. Select MMSI or My MMSI
    4. Enter your 9-digit MMSI using the keypad or channel knob
    5. Confirm the entry when prompted — many radios ask you to re-enter the number
    6. The radio will display a warning that this number cannot be changed; confirm to save

    On Standard Horizon radios: Menu → DSC → MMSI Input. On Icom radios: Menu → DSC Setting → Individual ID / MMSI. On Garmin and Uniden radios, the path is similar — check the manual if the menu structure differs.

    After saving, verify the MMSI displayed in the DSC status screen matches what you registered. If it doesn’t match, do not proceed — contact the manufacturer for the correction procedure before using DSC.

    Step 3: Connect GPS for Position Data

    A VHF radio without GPS sends a DSC distress call with your MMSI and distress type, but no coordinates. The Coast Guard receives the alert and has to ask where you are — which assumes you’re conscious and able to answer. A radio connected to GPS automatically embeds your current position in the distress signal.

    Most fixed-mount DSC radios have an NMEA 0183 input (two wires: positive and negative from a GPS talker) or an NMEA 2000 connection. Check your chartplotter or GPS for a VHF NMEA output and run a connection. Once connected, the radio should display GPS position data on its screen — look for a GPS indicator or coordinates in the DSC menu.

    If your boat has a chart plotter network, this connection is usually straightforward. For boats with a single standalone GPS, you may need an adapter cable. Fisheries Supply carries NMEA interface cables and VHF accessories for common radio models.

    Step 4: Configure Key Channels

    Marine VHF channels are standardized, but a few require intentional setup on your radio.

    Channel 16 — Distress, Safety, and Calling: This is the international hailing and emergency channel, monitored continuously by the US Coast Guard. All vessels with VHF radios are required to monitor Channel 16 when underway. It’s typically the default channel on power-up — don’t change that default. Use Channel 16 to hail another vessel, then switch to a working channel for the actual conversation.

    Channel 9 — Recreational Calling: The secondary calling channel for recreational boaters in US waters. Many boaters monitor both 16 and 9 using Dual Watch. Marina and bridge contacts often prefer Channel 9 for initial hailing in areas where 16 is congested.

    Channel 22A — USCG Working Channel: After a distress call on Channel 16, the Coast Guard typically shifts communication to Channel 22A. Make sure this channel is unlocked and accessible on your radio — some radios sold internationally ship with certain channels disabled.

    Common recreational working channels: 68, 69, 71, 72, and 78A are the standard non-commercial recreational channels for marina-to-vessel and vessel-to-vessel communication. Keep these in your normal channel rotation.

    Channel 13 — Bridge-to-Bridge Navigation: Used by commercial traffic and bridge tenders for navigational safety communication. Operates at 1 watt only. If you’re transiting a drawbridge or passing a commercial vessel in a channel, this is where to hail them.

    Step 5: Set Up Weather Channels and NOAA Alerts

    NOAA Weather Radio broadcasts continuous weather forecasts and marine warnings on WX channels 1 through 7 (162.400–162.525 MHz). Your radio’s WX button cycles through these channels — tune to the one with the strongest signal in your area. On the East Coast, WX1 (162.400 MHz) and WX2 (162.425 MHz) cover most regions.

    The more important setting is the Weather Alert (also labeled NOAA Alert or WX Alert on some radios). When enabled, the radio automatically breaks squelch and sounds an alarm when NOAA broadcasts a specific alert tone — typically used for sudden severe weather, storm warnings, or special marine warnings. This feature can alert you to a storm warning even if the radio is on standby in the cabin.

    To enable weather alerts: Menu → Weather → Weather Alert → On. The exact path varies by manufacturer. On Standard Horizon radios, it’s accessible directly from the WX button. Test the alert function by checking that the alert indicator is active in the radio’s status display.

    Step 6: Configure Scanning and Dual Watch

    Dual Watch monitors Channel 16 continuously while also monitoring a second channel of your choice. This is the standard operating mode for coastal cruising — you stay on your working channel but the radio snaps to Channel 16 the instant traffic appears. Enable Dual Watch through the menu or the dedicated DW button (labeled on most radios).

    Priority Scan cycles through a programmed list of channels while always returning to Channel 16 between scans. Useful for monitoring multiple working channels in a busy harbor. Set up a scan group that includes channels 9, 16, 22A, and the working channels you use most.

    For most coastal cruising, Dual Watch on Channel 16 with your current working channel is sufficient. Priority scan adds value in busy anchorages or when covering a multi-day passage with varied traffic.

    Step 7: Test Everything Before You Leave the Dock

    Before the season’s first trip, verify the following:

    • MMSI is correctly displayed in the DSC status screen
    • GPS position data is showing in the DSC menu (if connected)
    • DSC Distress button cover is in place and functional
    • Weather Alert is enabled and the WX channel is receiving clearly
    • Dual Watch is functioning — the radio is scanning Channel 16
    • Radio check on Channel 16: hail “radio check” on 16 and switch to a working channel to confirm with a marina or nearby vessel

    For a DSC test, use the radio’s built-in DSC Test Call function — never hold the red Distress button to test. A DSC Test Call sends a non-emergency formatted test message to a designated station. A Distress button press transmits a live distress signal to the Coast Guard.

    For guidance on choosing the right antenna to pair with your radio, see our VHF radio antenna selection guide. And if you’re due for an upgrade, our guide to the best VHF radios for coastal cruising covers current models with DSC, GPS integration, and AIS receiving.

    Frequently Asked Questions

    Do I need to register my MMSI before using my VHF radio?

    You don’t need to register your MMSI before using voice channels, but you should register before relying on DSC. The MMSI is required for DSC distress calls to properly identify your vessel to the Coast Guard. Without a registered MMSI programmed into the radio, a DSC distress signal transmits without vessel identification. Registration is free through BoatUS or Sea Tow for recreational vessels operating domestically.

    Can I change my MMSI after programming it into the radio?

    On most radios, no — at least not without a manufacturer reset procedure. Most DSC-capable VHF radios allow the MMSI to be entered only once. If you entered it incorrectly or the boat changed ownership, contact the radio manufacturer for the reset procedure. Double-check the number before confirming entry — that’s easier than dealing with a factory reset later.

    What is Channel 16 used for?

    Channel 16 (156.800 MHz) is the international VHF distress, safety, and calling channel, monitored continuously by the US Coast Guard. All vessels with VHF radios are required to monitor it when underway. Use it to hail other vessels or call for assistance, then switch to a working channel for extended conversation. Don’t use Channel 16 for routine radio checks or non-urgent traffic.

    Does my VHF radio need a GPS connection for DSC distress?

    A GPS connection is not required to send a DSC distress signal, but it improves effectiveness significantly. Without GPS, the distress signal includes your MMSI and distress type but no coordinates — the Coast Guard has to ask your position. With GPS connected, your current coordinates are automatically included. If your radio has a GPS input, connect it.

    How do I test my DSC distress function without sending a false alert?

    Use the radio’s DSC Test Call function, accessed through the DSC menu — not the red Distress button. A test call sends a formatted non-emergency message to a designated station without generating a USCG alert. Never press and hold the red Distress button as a test; that transmits a live distress signal. If you accidentally trigger a false distress call, stay on Channel 16 and immediately notify the Coast Guard it was accidental.

    Further Reading

  • VHF Radio Antenna Selection Guide for Coastal Cruisers






    A VHF radio is only as good as its antenna. The radio you bought may have 25 watts of output and full DSC capability, but if it’s connected to an undersized antenna routed through cheap coax and mounted at deck level, you’re giving up most of that range before the signal ever leaves the boat.

    VHF communication — with the Coast Guard, other vessels, marinas, and bridge tenders — is one of the most operationally important systems on a coastal cruiser. Getting the antenna right is worth the effort. Here’s what you need to know to make a good selection.

    Why Antenna Selection Matters

    Marine VHF operates in the 156–174 MHz frequency band. At those frequencies, signals travel in straight lines — they don’t bend over the horizon. Your effective range is determined by two things: antenna height and antenna efficiency. A taller, more efficient antenna reaches farther. A short, lossy antenna limits your communication range even if your radio is transmitting at full power.

    On a coastal cruise, practical range to a Coast Guard station or another vessel is typically 10–25 nautical miles depending on antenna height on both ends. That range can drop to 5–8 miles with a poor antenna setup. In a man-overboard or distress situation, that difference matters.

    VHF is also the required communication system for vessels in US coastal waters. For a breakdown of all required equipment by vessel class, see our guide to USCG required safety equipment.

    Understanding Antenna Gain

    Gain is the most discussed antenna spec and the most misunderstood. Gain does not mean the antenna amplifies your signal — it means it redistributes the signal. A higher-gain antenna focuses power into a flatter, more horizontal radiation pattern, which increases range on flat water. The tradeoff is a narrower vertical coverage angle.

    Marine antennas are rated in dB. Here’s what the common ratings mean in practical terms:

    3dB: Wide vertical pattern. Signal spreads roughly 45 degrees above and below horizontal. Suitable for sailboats and any vessel that heels or pitches significantly. Consistent performance across a range of conditions.

    6dB: Narrower vertical pattern, roughly 15–20 degrees above and below horizontal. Better range on flat water. The sweet spot for most powerboats and catamarans that stay relatively level. A popular all-around choice.

    9dB: Very narrow vertical pattern — roughly 8–10 degrees. Maximum range in flat, calm conditions. Significantly degraded performance on a heeling or pitching boat. Best suited for large powerboats in protected waters, or as a second antenna on a dedicated high-gain mount.

    For coastal cruising sailboats, 3dB is the standard recommendation. For powerboats and catamarans, 6dB offers a better range-to-reliability tradeoff.

    Mounting Location: Height Beats Gain

    VHF range scales with antenna height. The approximate formula is: range in nautical miles ≈ 1.23 × √(antenna height in feet). At 16 feet above water, you have about 5 nm of range to a vessel at sea level. At 25 feet, about 6.2 nm. At 50 feet (a typical sailboat masthead), about 8.7 nm.

    This means that a 3dB antenna at 50 feet will dramatically outperform a 9dB antenna at 8 feet. Height is almost always the bigger variable. Mount your antenna as high as practical.

    Common mounting positions and their tradeoffs:

    • Masthead (sailboats): Maximum range, always vertical regardless of heel. Requires a longer cable run — plan for 50–70 feet or more — and low-loss coax to offset signal loss. Most cruising sailboats eventually put the primary antenna here.
    • Stern rail or pushpit (sailboats): Easy installation, short cable run, but low height (6–8 feet) and the antenna heels with the boat. Acceptable as a backup or secondary antenna.
    • Flybridge or hardtop (powerboats): Good height, stable platform, typical sweet spot for motorboats. Mount clear of other antennas and metal structures.
    • Tower or mast (powerboats): Maximum height for sportfishing boats or trawlers with tall structures. Excellent range.

    Avoid mounting antennas near radar domes (interference) or parallel to each other at the same height without at least 3 feet of separation.

    Cable and Connectors: Don’t Cheap Out Here

    Signal loss in the coax cable is cumulative and permanent — it degrades every transmission and reception. The two variables are cable type and cable length.

    RG-8X is the standard flexible marine coax for most installations. It loses about 1.5 dB per 100 feet at VHF frequencies. For runs under 30 feet (typical on powerboats), it’s fine.

    RG-8U (also labeled RG-213) is stiffer but lower loss — about 1.2 dB per 100 feet. A better choice for moderate runs of 30–60 feet.

    LMR-400 or equivalent low-loss coax runs about 0.7 dB per 100 feet and is the right choice for masthead installations on sailboats, where cable runs of 50–70 feet are common. The extra cost is worth it — you’re preserving the height advantage you installed the masthead antenna to get.

    PL-259 connectors are the standard for marine VHF. Proper installation matters: connectors should be soldered (not crimped only), weatherproofed with self-amalgamating tape, and inspected annually. A corroded PL-259 connection can cost you 3–6 dB of signal loss on its own — more than you’d gain by upgrading the antenna.

    Top Antenna Options for Coastal Cruisers

    These are proven, widely-used antennas available through Fisheries Supply:

    Shakespeare 5101 (3dB, 8-inch whip): A short, collapsible backup antenna that mounts to a PL-259 connector directly. Useful as an emergency spare or for a handheld radio on a fixed mount. Not a primary antenna for coastal cruising, but worth carrying.

    Shakespeare 5400-HD (6dB, 4-foot fiberglass): One of the most widely installed VHF antennas on coastal powerboats. Fiberglass construction, stainless hardware, ratchet base for adjustment. A solid all-around choice for flybridge or hardtop mounting.

    Shakespeare 5225-XT (6dB, 8-foot): For powerboats that want more range. The longer element provides higher gain than the 4-foot version. Requires a more secure mount due to length and wind loading.

    Glomex RA300 (6dB, 4-foot fiberglass): An Italian-made antenna with a strong reputation among offshore and coastal sailors. Available in deck-mount and masthead configurations. Well-regarded for build quality and corrosion resistance.

    Shakespeare 5215 (3dB, 4-foot): The go-to deck-mount antenna for sailboats that aren’t yet running a masthead antenna. Clean fiberglass construction, widely available, easy to install. Provides consistent performance across heeling angles.

    Browse Fisheries Supply’s full selection of VHF antennas and accessories for current stock and pricing across these brands.

    Putting It Together: A Decision Framework

    For a coastal cruising sailboat: Start with a 3dB deck-mount antenna (Shakespeare 5215 or equivalent) for easy installation. If you’re doing regular overnight or passage work, plan a masthead installation with low-loss coax — the range improvement is substantial and worth the one-time rigging effort.

    For a coastal powerboat: A 6dB 4-foot fiberglass antenna on the flybridge or hardtop is the right baseline. If you run a center console or open boat where height is limited, consider a mount that elevates the antenna as high as possible, and size up to an 8-foot element if the boat’s structure supports it.

    In both cases: use quality coax, make clean weatherproof connections, and inspect them every season. Cable and connector degradation is the most common cause of poor VHF performance on older boats — and the most overlooked.

    Once your antenna is sorted, the next step is getting your radio properly programmed. See our guide on how to program a marine VHF radio for MMSI registration, DSC setup, and channel configuration.

    Frequently Asked Questions

    What antenna gain is best for a sailboat?

    3dB is the standard recommendation for sailboats. Sailboats heel underway, and a 3dB antenna maintains more consistent coverage across a wider vertical angle. A 6dB or 9dB antenna compresses the signal pattern into a tighter horizontal band — when the boat is heeled 15–20 degrees, a high-gain antenna can transmit and receive poorly to one side. A masthead-mounted 3dB antenna benefits from height and is the preferred setup for cruising sailboats.

    How high should a VHF antenna be mounted?

    As high as practical. VHF signals are line-of-sight — height directly extends range. The approximate formula is: range (nautical miles) ≈ 1.23 × √(antenna height in feet). A 16-foot antenna height gives roughly 5 nm to another vessel at sea level. On a powerboat, mount on the flybridge or hardtop, not at deck level. On a sailboat, a masthead mount dramatically outperforms a deck-level stern mount, at the cost of a longer cable run.

    Does cable length affect VHF antenna performance?

    Yes, significantly. All coaxial cable loses signal with length. At VHF frequencies, RG-8X loses about 1.5 dB per 100 feet, and RG-8U loses about 1.2 dB per 100 feet. For masthead runs on sailboats (often 50–70 feet or more), upgrade to low-loss coax like LMR-400 (about 0.7 dB/100 ft) to preserve the advantage of the height.

    What is the difference between 3dB and 6dB antenna gain?

    Antenna gain redistributes power rather than adding it. A 3dB antenna radiates over a wide vertical angle — good for boats that pitch and roll. A 6dB antenna focuses the same power into a narrower horizontal plane, which extends range on flat water but degrades when the boat is heeled or pitching. On a stable powerboat in calm conditions, 6dB extends range noticeably. On a coastal sailboat, a 3dB antenna is more consistent across real-world conditions.

    Do I need a separate antenna for DSC?

    No. DSC (Digital Selective Calling) operates on Channel 70 (156.525 MHz), which is within the standard marine VHF band. Any USCG-approved VHF antenna covers it. Your fixed-mount radio’s antenna handles both voice communication and DSC distress calls without any separate antenna.

    Further Reading