Originally Posted by ashbypower
Useless unless it sends the data, you may just as well have a non DSC set. Because all it will send is a DSC Distress alert, the Nature (if you have selected one) and your MMSI.
Not withstanding the comments of the others about a Garmin 12 (or similar - last time I looked there were Serial/RS232 GPS "Mice" available for about £20+postage) - I would suggest that DSC Distress via the red button still has some value even without the position information.
(1) It will wake up any vessel within radio range by triggering the alarm.
(2) The DSC message is very simple for anyone to send in a panic situation - lift flap hold down button for 5 seconds. A voice call from a panicked wife might not get even the basic info this will have across - and your "crew" may not be in a position to give a good location immediately anyway.
(3) The distress alert keeps repeating until acknowledged allowing you to tend to casualties, bail, pee on your burning outboard etc.
Some people have suggested a DSC message may be more likely to get through over long distance too (although I know Codprawn always argued analogue was more likely with a weak signal).