the unit won't lock on satilites at all they said it was the gps ant i send it in they sent me a new one same problem i called them again said it was the wirering check all the wireing and fuse nothing called agained send unit back w/all power-cables to lowrance 3 times now in 10 mos also my nav -card show nothing what would you shed on this any helpwould be great ant mount 3 1/2 ft from unit on gunnel unit mount on dash wirers are hooked up to the cranking battery w/fuse's on power cable and gps -cable this has been a problem all yr to me .frank