My first motor would not acquire a gps lock. Turned out to be a bad internal gps puck. MG sent me a new software up load which of course did not fix it. Took the thing back to BPS within the grace period after purchase, they swapped me out for a new one.
I haven't had any real trouble with it since. It doesn't like to spot lock under bridges real well, and sometimes while in course lock and cruise control it will just take off at full speed which is irritating, but all in all, I like it, I think it is the neatest thing since pockets on a shirt.
My money is on the GPS puck, for the fix. The software up grade was free and easy to do.
One more thing...mine is not wired into any other equipment for navigation.