I lost my Gps on my 797. It doesn't say no connection or anything like that, just no GPS anywhere. Not when I scroll the screens or when in the menu. Cleaned connections and such but know luck. It is on my simulator mode though, but didn't notice if it was showing a correct reading while in simulator. I have use my unit in the house with no puck connected to add waypoints, I don't know what it could be. Is it my puck or what. Please help!!