Get your DSC-equipped VHF hooked up right

by BoatUS/Sail-World on 29 Oct 2013 With summer approaching fast, it's time to make sure you have a VHF on board working to the maximum. If you have a basic VHF, checking the connections for corrosion, inspecting the antenna and doing a simple radio check may be all that it takes. But if you have a newer Digital Selective Calling (DSC) VHF, this is the time to ensure its life-saving, one-button mayday feature is fully working. This allows anyone on the boat to simply press a button that gives rescuers near pinpoint location and identification information, greatly speeding rescue times.

However, the DSC functions on new radios only work if a Maritime Mobile Service Identity number (MMSI) has been entered into the radio. Further, the Coast Guards report that approximately 80% of the one-button distress calls from DSC VHF radios they get each year do not contain vessel position information, meaning that life savers cannot effectively respond.

Boaters can take two simple steps to make sure their DSC radio will provide rescuers with the information they need:

Number One: Connect the DSC-VHF to the GPS/Chartplotter. While some of the newest handheld DSC VHF radios have GPS built in, most fixed-mount DSC VHF radios must be connected to an external chartplotter in order to broadcast location information. This single, critical wired connection increases your margin of safety a thousand times over by allowing rescuers to find you quickly.

Number Two: Get a free Maritime Mobile Service Identity (MMSI) number that identifies your boat. The MMSI number is a bit like a phone number for your boat. Having one helps verify an emergency, identifies your boat to rescuers, and cuts down on the instances of false alarms, ensuring that critical rescue resources will be available when you need them.

While there have been challenges with a uniform, industry-wide plug-in connector to make it easy for do-it-yourselfers, having both the radio and chartplotter of the same brand and each manufactured within several years of each other makes it easier.

Taking the time to open up both operating manuals is also a good first step - you likely won't need to know how to read a wiring diagram as instructions are in plain text. Most electronics manufacturers also have customer support phone lines ready to help. And if you're still having trouble? Get a professional electronics installer to do the job. After all, aren't your family's lives worth a relatively small $150 service fee to have a pro do it right?

To find one near you, ask at your local marine electronics retailer, marina or go online and start searching for your nearest help.

In Australia; http://www.amsa.gov.au/mmsi/

In New Zealand: http://www.rsm.govt.nz/