Quote Originally Posted by Brn2fsh View Post
Maybe I missed it in there somewhere, but is your problem unit a internal GPS antenna unit? These sometimes have issues with GPS speeds under 1.5 mph or so. You can switch the unit mount with the older 788, if it has an external GPS antenna it should fix the problem, if it does help, you can buy a y cable to run both units off the external antenna. Hope this helps!
Both are internal.