got my boat out today after a new install of a 1198 si and a 80 lb terrova no I*link as of yet lol ...... before I left the house while boat was inside the garage I plugged the loc in and powers up, all is working good GPS lock all strong ..... inside a garage, we get to the lake and do alittle test ride to check and see if transducer will rooster all seems good head to a spot to fish, I check my nav maps only to find I have no GPS lol ok so we get to the first fishn spot I have to move the loc to the TM mount with its own GPS puck all works fine we do this move back and forth from TM to the helm 5 or 6 times each time transom GPS puck wont work TM puck works fine lol So I get home put boat in the garage and check rear puck again only yo get a stronger Lock than I had all day ???

garage is wood, stick built (2x4's) with shingles

anyone got any ideas lol

thank you all