Originally Posted by denverd0n
True, but only if the boat's VHF is the type that can display where you are, and only if everything is setup properly on both the handheld and the boat's fixed VHF.
People shouldn't think that all they have to do is buy one of these newfangled handhelds and the ancient VHF on their boat will magically know where they are.
Yea, didn't go into all the details. Your DSC vhf on the boat will display their log/Lat and from there use your chart or chart plotter to find the MOB. Depending on your set up and equipment a vhf may display the location of the MOB or you could interconnect to your chart plotter to give a display of the MOB.
If the Coast Guard recieves your DSC MOB signal, they will have necessary equipment to know where you are and probably have a bird over you in 1 hours (especially if you are able to tell them you are a MOB over the VHF). If you did not have the GPS/DSC hand held VHF you might be still able to talk to the Coast Guard, but it would be difficult for you to describe where you are. The coast guard could use radio direction finding, but the GPS/DSC is the more accurate and faster option.
I like this man's story, seems one of the most important things is to never give up. BTW, he did have one of those divers VHF but apparently the battery was dead.: