please clarify, cat
Not sure what you're asking here? The electrical source should be your battery supply, and you should wire through the pedestal to the electrical panel in your cabin. If you are replacing the the Garmin, you could probably connect the new A50 to the existing positive, negative, and ground wires used to power your old GPS. If you're asking about another place on your boat to mount, it's very much up to you. Are you looking to supplement your existing GPS, or replace it? I recently flush-mounted my new A65 to an existing Navpod at the pedestal.