Yep, that is what I am thinking now after doing what HBGreg suggested. It works fine on my 787 mount and my 787 acts up when I plug it into my 797 base. AMAZING, a transducer goes bad just out of the blue. I am growing So tiredof the trouble. Upgrade to fix an Upgrade. I just want my stuff to work!!!!! By the way Greg I spent almost 30 min. on the phone with your customer service yesterday trying to trouble shoot my problem before I was asked my phone number and email address so that the problem could be researched further. I was promised a response yesterday. Guess what? STILL WAITING!! I am not trying to take out anything on you personally, but other than the slow GPS response my 797 worked great up until the UPGRADE. It's just very frustrating. Thanks for your help, I really do thank you.