Just a heads up to you that have a hand held that needs a 3v output source you can get a straight lighter pluggin for your 24v system to run your garmin GPS etrex or other GPS from :
http://www.pfranc.com/cgi-bin/pub/u_OR/?pid=ePC6
at about 27 bucks canadian you can't go wrong.
http://www.pfranc.com/cgi-bin/pub/u_OR/?pid=ePC6
at about 27 bucks canadian you can't go wrong.