I currently have a GPS unit hooked up to my 996XT in my truck. I was receiving a signal one day, and the next nothing. I checked the power supply for the GPS, which was plugged in, and I even unplugged it and plugged it back in to see if that did anything, and it did nothing. Next I shut down the 996XT, to see if maybe that would recognize the GPS, to which it did not. I double checked my settings on the radio to make sure I didn't accidentally change something, and everything is normal. I've been using the same GPS for a couple years now...is there a shelf life to these units? Any ideas on how to remedy the problem, short of purchasing a new unit and seeing if that does the trick? Any ideas and feedback is welcome! Thanks.