Recently sent the Nortech back for a few upgrades. Had them put the new Mercury Vessel View in it. Problem is now, I get no engine date to either of the 8215 garmins. Also, the 8215's show the boat is Miami when I'm in fact in Kemad. Sonar works fine, radar works fine, can't get a gps signal. Bought a new GPS puck and a couple of nmea connections in case one of is bad. Have for changed the puck but I've tight3ned existing connection