By Tom Burden
Your VHF radio is the primary way for you to communicate with other boat operators or a bridge tender, lock operator, harbormaster, race committee, and rescuing agencies like the Coast Guard or a towing service. Arguably the most important safety item onboard your boat, a VHF radio is far more reliable than a cell phone, with limited on-water range and dropped calls.
Rescuers like Vessel Assist, TowBoat U.S. and the Coast Guard monitor VHF transmissions, so it is easy to call for help in an emergency. Many boating authorities advise carrying both handheld and fixed mount VHFs, which are equally valuable onboard for their own unique sets of benefits.
Below are some selection questions for buying a handheld VHF radio:
If your radio goes overboard, a floating handheld gives you another chance to avoid a big disappointment and a trip to the store for a new radio. Although floating radios are a relatively recent idea, about half of the handheld radios we’re selling now float. ICOM has further enhanced their newest M24 and M92D handhelds with their “Float ’n Flash” feature. These radios float face-up, and the screen, buttons and several LED lights on the base all flash on and off. Standard’s HX300 includes a similar feature, with a flashing red LED on the radio’s base.
Radios operate for a range of between 7 ½ and 20 hours. Battery life depends on the radio’s physical size, which determines just how big of a battery it will hold, whether it transmits at 5 or 6 watts on the high power setting, and if the battery pack also powers a GPS receiver. In general, floating VHFs have shorter battery life than heavier, non-buoyant models. What matters most to many boaters is the answer to this question; will the radio operate all weekend without a recharge?
|Radio Model||Rated Battery Life||Floats? Flashes?||Display||GPS?|
|HH36||11 hrs.||Floats||Dot matrix||Yes|
|VHF460||10 hrs.||Floats/Glows||Dot matrix||Yes|
|HX870||12 hrs.||Floats/Flashes||Dot matrix||Yes|
|M92D||8-10 hrs.||Floats/Flashes||Dot matrix||Yes|
Many radios use a seven-segment LCD display. As its name implies, numbers in seven-segment displays are composed of seven individual elements, and they create the type of chunky, rectangular numerals we’re all familiar with. Each part of the screen, such as the battery life indicator, has segmented components that perform just one function. Dot matrix displays are miniature versions of LCD screens seen on TVs, smartphones and other devices. They can display any monochrome pattern of dark and light elements, make choosing functions simpler, and allow rounder, more lifelike and readable numerals. Dot matrix displays are rated for screen resolution by their pixel count.
Several radios include a built-in GPS receiver, which you can use for navigation, providing your Lat/Lon position and allowing you to navigate to stored waypoints. These VHF/GPS combo handhelds include Digital Selective Calling (DSC), which functions as a sort of VHF-frequency emergency beacon. Just push and hold down the red DISTRESS button on your handheld VHF radio, and it sends an automated digital distress message to the Coast Guard and all other DSC radio-equipped vessels. Rescuers instantly know who you are, where you are (using GPS coordinates), the name of your boat and the phone numbers of your emergency contacts.
DSC also provides non-emergency capabilities, allowing you to communicate individually with another boat or group of boats using MMSI numbers. You can send and receive each other’s positions as well, if your radio and the other vessel’s radio are interfaced to GPS. While we’re excited by the promise of these features, we actually haven’t heard of many of our customers using them, and the user-interfaces of the radios can make the more complicated features challenging to use.
To get the safety benefits of DSC you must obtain your nine-digit MMSI number. We recently purchased an ICOM M92D, and it took about ten minutes to go on the BoatU.S. web site and register our new DSC radio. We logged onto http://www.boatus.com/mmsi/ and followed the instructions. The registration is free, and by registering your beacon, you’ll be prepared in an emergency.
Even though new handheld VHF radios—especially high-end models—now include accessories that once had to be purchased separately, you still might find yourself longing for one particular piece that the manufacturer did not include with your model. Here is a short list of items we consider practical and useful for handheld VHF radios:
Drop-in chargers make it easier to keep the radio powered up, so it is ready when you need it. There are two types: slow chargers (9 to 15 hours) and rapid chargers (2 1/2 hours or less). Rapid chargers have voltage regulation and sensing circuitry to turn themselves off. This may not be the case with slow chargers. The best solution, in our opinion, is a fast drop-in charger base with interchangeable 12V DC and 120V AC power cords.
Alkaline battery packs let you use inexpensive, long-storage-life disposable batteries in your radio. They allow your radio to keep operating when you’re not able to recharge, and at 68°F, they still have 90% of their capacity after three years of storage. In emergencies a spare pack of alkaline batteries can be a lifesaver.
Antenna adapters connect your handheld to the ship’s antenna. This extends the range of the handheld dramatically, and is an important safety feature should your fixed radio fail. The type of adapter varies with the brand of radio: most use a BNC connector, while others use a special connector. All provide male PL-259 threads for connection to the antenna coax cable.
Some companies also offer VOX or voice-activated transmission headsets, which means you don’t even have to press the PTT button before speaking. They, too, provide private listening.
Handhelds are limited to a transmit power of six watts, compared to 25 watts for fixed-mount radios. Remember, VHF range is more dependent on antenna height and antenna gain than on transmit power, so you can add significantly to your range by connecting an external antenna or by transmitting from the highest location available. For normal handheld use (at five-watt transmit power), figure on a 3-8 mile range from a small boat, compared to 15-20 miles with a fixed-mount radio (at 25 watt transmit power.)
How much difference does increased transmit power make? Very little on the range of the communications. ICOM states that by switching from one watt to three watts of output you may gain 10 percent in range, but your battery life is dramatically reduced when you transmit at high power. The batteries in handhelds vary in capacity from about 500mAh to 2000mAh, and the current draw on high-power transmit can be in the two-amp range. This quickly depletes a battery if there is lots of conversation. Note: Radio manufacturers measure their battery life on a 90/5/5 basis: 90 percent standby, 5 percent receive, and 5 percent transmit at high power.
The VHF band is, by law, intended for marine use only. Several radios, such as the West Marine VHF255, offer additional bands, notably the Family Radio Service (FRS) band for local land communication. The ICOM M88 and Standard HX400 include programmable Land Mobile Radio (LMR) channels for land mobile communication.
Most handhelds feature automatic weather alerts, which notify you when they detect a special weather warning signal from NOAA, to inform you about thunderstorms, tornados or other extreme weather. The West Marine VHF160 and VHF460 feature an improved weather alert function, Specific Area Message Encoding (S.A.M.E), so you only have to listen to alerts for localized weather in your area, not forecasts from many miles away.