I believe that HB has got some bad Internal GPS receivers. I have a new 788 HD DI that the GPS is not working properly. I also have 3 friends that have bought 700 series units in the last year that are having GPS problems. I also had to send a 797 back a few of years ago GPS problems.

I have all the faith in the world in HB's Customer Service. They have always done me right. My only grip is having to pay another shipping charge on a Unit that I just paid over $20 to get it shipped to me 2 months ago. It has not gotten a good signal since I installed it.