Hey all, anyone have a Garmin GSD -21 sounder module, it was discontinued. Red
redhead78 . Dec 30, 2009 680 jeanneau 38 gin fizz sloop Summer- Keyport Yacht Club, Raritan Bay, NJ, Winter Viking Marina Verplanck, NY Apr 21, 2011 #1 Hey all, anyone have a Garmin GSD -21 sounder module, it was discontinued. Red
