On Tue, 17 Jan 2006 16:55:55 GMT, "Dennis Pogson"
wrote:

Do you mean a handheld Garmin with 2 wires from data-out and ground leading
to a GMDSS VHF radio?

Haven't the foggiest what GMDSS means (and prolly don't want to), but
yes it's 2 wires plus ground from the handheld with the 2 wires
leading to the data in and data out connections on the VHF.