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A VHF radio is the one piece of gear that connects you to other boats, marinas, bridge tenders and the Coast Guard within seconds. Choosing between a fixed-mount and a handheld isn't a matter of taste: it depends on where you boat, what kind of vessel you have and how far offshore you go. This guide gives you the criteria to decide.
The short answer
On a cabin cruiser, a sailboat or any boat that goes beyond sheltered water, your main radio should be a fixed-mount VHF with DSC, backed up by a handheld. On an inflatable, a small open boat or a skiff that stays close to shore, a good waterproof, floating handheld covers your communication needs at a fraction of the cost and with no installation.
If the budget allows, carry both: the fixed set rules while the boat has power and an antenna; the handheld goes with you to the dinghy, the life raft or when the battery fails.
Fixed vs handheld: comparison table
| Feature | Fixed VHF | Handheld VHF |
|---|---|---|
| Maximum power | 25 W (1 W low) | 5-6 W (1 W low) |
| Antenna | External, 3 to 8 ft or masthead | Short, at hand height |
| Typical boat-to-boat range | 7 to 15 nautical miles | 4 to 5 nautical miles |
| DSC with position | Almost always (Class D) | Mid and high-end models only |
| Chartplotter link (NMEA) | Yes | Generally no |
| Power | Boat battery, 12 V | Own rechargeable battery |
| Usable off the boat | No | Yes: dinghy, raft, abandoning ship |
| Installation | Antenna, coax, power and GPS | None |
| Price range | Mid-range, plus antenna and cable | Budget to mid-range |
Range: antenna height beats wattage
VHF waves travel in a straight line, a bit like your line of sight. That's why range depends mostly on how high the two antennas are. A rule of thumb: range in nautical miles ≈ 1.23 × (√h1 + √h2), with heights in feet.
- Fixed set with the antenna at 10 ft, talking to a similar boat: about 7 miles.
- Two handhelds held at 5 ft: about 5 miles.
- Masthead antenna on a sailboat of about 50 ft, talking to a low boat: close to 12 miles.
- Coastal stations on high ground: 30 miles or more.
Going from 5 to 25 W helps against noise and obstructions, but the range gain is modest. Raising the antenna a few feet usually pays off more than extra watts.
Tip: if you carry a handheld, use it on deck and hold it as high as you can, not down in the cabin. The hull and house cut the signal a lot.
When to choose a fixed-mount VHF
A fixed set is the real radio of the boat. Its 25 watts and a high antenna multiply your range, the speaker is heard over the engine, and the GPS link means a distress alert goes out with your exact position without touching anything else. Many modern fixed radios add a built-in GPS, a hailer function and, at the high end, an AIS receiver.
Choose a fixed set if you have a cabin or a sailboat, if you boat far from shore or at night, and if you want the radio tied into your chartplotter. Read our comparison of VHF and AIS antennas first, because the antenna is half of the system.
When a handheld is enough (or smarter)
On an inflatable or an open boat there's rarely a protected spot for a fixed radio, or a mast for the antenna. A waterproof (IPX7 at minimum), floating handheld VHF works well on those boats, charges at home and goes with you in the dinghy or ashore. For real-world use, check these points:
- Waterproofing: IPX7 or better. If it floats, even better, because radios go overboard more often than you'd think.
- Battery life: with a 5/5/90 duty cycle (5% transmit, 5% receive, 90% standby), a lithium-ion pack usually lasts a full day.
- DSC and GPS: available on mid and high-end handhelds, letting you send a distress alert with your position from your hand.
- Charger and batteries: an alkaline battery tray as an emergency backup is a plus on longer trips.
DSC and MMSI: what you need to know
DSC (Digital Selective Calling) lets you send a distress alert, with your identity and position, to every station in range at the push of a button. To work it needs a nine-digit MMSI number programmed into the radio, and the radio must receive a position from its built-in GPS or your chartplotter over NMEA. A DSC alert without a position is far less useful.
If you carry a fixed set and a handheld, each one needs its own MMSI (a handheld's is normally different from the boat's). In the US, you can get an MMSI through a registered assignment provider or through the FCC when you license a ship station; check current rules before you program the radio.
Licensing and rules
In the US, recreational boats on domestic voyages are generally not required to carry an FCC ship station license, but you're expected to follow FCC radio rules, including keeping Channel 16 for distress and calling, and never transmitting a false distress. If you go abroad, or use a radio with certain features, requirements change. Requirements differ elsewhere, so check your own country's rules if you boat outside the US.
Whatever is mandatory, we recommend DSC with GPS position for anyone leaving sheltered water, and a floating handheld for anyone venturing out in an open boat. See also our list of sailboat equipment for the rest of the gear.
Installing a fixed VHF
- High, clear antenna: away from other antennas and the radar. On sailboats, a short 3 dB antenna at the masthead; on powerboats, a 3 to 8 ft fiberglass whip with 3 to 6 dB of gain.
- Short, good-quality coax: RG58 for short runs; RG213 or equivalent low-loss cable beyond roughly 30 ft. Every extra foot loses signal.
- Well-made connectors: a poorly crimped or waterlogged connector is the most common failure. Seal with self-amalgamating tape and check the standing wave ratio (SWR) with a meter.
- Direct fused power: properly sized wire from the panel or battery, with its own fuse, kept away from power cables to avoid noise.
- GPS and NMEA: connect the radio to the chartplotter or use the internal GPS so the DSC alert carries a position.
Warning: never press the DSC distress button just to see if it works. It sends a real alert and triggers a rescue response. To check the radio, do a radio check on the channel designated for that.
Using it right, and common mistakes
Channel 16 is for distress and calling and should be monitored whenever you're underway; channel 70 is reserved for DSC and nobody talks on it. Call, agree on a working channel and switch, so you don't tie up 16 with chat.
- Buying a powerful fixed set and leaving it with a short antenna mounted low, inside the cabin.
- Forgetting to program the MMSI or connect the GPS, so the alert goes out with no position.
- Carrying only a handheld, with a flat battery and no charger aboard.
- Not checking antenna connectors every season: salt corrosion cuts range without warning.
- Not deciding who uses the radio in an emergency: everyone aboard should know how to make a Mayday call.
For offshore trips, a personal locator beacon doesn't replace the radio, but it adds an independent way to raise the alarm.
Recommended gear for this guide
Frequently asked questions
Is a fixed or a handheld VHF better?
A fixed VHF is better as the main radio: it transmits at 25 W, uses a high antenna and usually includes DSC and GPS. A handheld is better as a backup and on open boats with no room or power for a fixed set. On a cabin boat that goes more than a few miles offshore, the ideal is to carry both.
How much farther does a fixed VHF reach than a handheld?
With the antenna at 10 feet, a fixed set reaches a similar boat at about 7 nautical miles, against about 5 for two handhelds. With the antenna at the masthead of a sailboat, boat-to-boat range goes beyond 10 miles. Antenna height matters more than power.
Do I need an MMSI number to use DSC?
Yes. DSC only identifies your boat if the radio has a nine-digit MMSI programmed in. If you carry a fixed set and a handheld, each needs its own number. Check how to get one through a registered provider or the FCC.
Can I connect a fixed VHF to my chartplotter?
Yes. Almost all fixed radios with DSC have an NMEA 0183 input and some have NMEA 2000, so they can take position from the plotter. That way a distress alert goes out with your exact position, and on some models you can see calling boats on the plotter screen.
What antenna does a fixed VHF need?
On powerboats, a 3 to 8 foot fiberglass antenna with 3 to 6 dB of gain, mounted as high as possible. On sailboats, a short 3 dB antenna at the masthead. Use good coax and keep the run as short as you can, because every foot loses signal.