Had the D3 in my other truck and then had it installed in my 08 Avalanche. Since I had it put in my new truck for some reason the gps arrow is not following along with the direction im going. It either moves backward or goes sideways on the trail. Any idea why this is happening. Any help would be appreciated. Thanks

Poor GPS signal or bad antenna connection?

I think that you have it set for "North Up" and instead of "Heading Up". There is an arrow on your navigation screen that is red at the end pointing to north. Touch that arrow and it should have you "heading up".

Did you reset the 3D Learning when you re installed it? It will need to be reset in your new vehicle. It is in the settings.