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You need to check the GPS reception, which shown on one of the screen, I think the main "map" screen you would normally see when using Nav. I believe you'll see it in one of the upper (?) corners. Looks sorta like this: -o- (like a satellite) and will indicate reception with a series of U shaped curves under the symbol (the more "curves" the better, kind of like the series of bars you get to indicate cellphone reception.) If you're showing NO curves under that symbol, and you go through the screen and find that screen where it lists how many satellites you're receiving, and it shows "0", one would be forced to think it's the antenna again.
Sometimes you do have to be patient with it. What would be a better "obvious" thing to do it to put the truck outside parked for about 1/2 hour, then see if you get any satellites, but make sure it's a nice unobscured place without alot of high buildings or trees blocking the sky.
If you do try to use the Nav, does it still show the vehicle in motion, or does it stay stationary? Even though it may be moving off the map, etc, it should still register motion from the wheel speed sensors. If it's not doing that, then I'd look at the possibilty that the Nav unit may be bad....
Gilly
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