If I play with the zoom-in/out (volume button up/down) while the unit is still loading, I cannot zoom-in in maps until I reset the unit. It stays zoomed out at its maximum position (seeing only the planet earth) and if I try to zoom in it simply won't.

 

If I left the zoom button untouched until the HU is fully loaded, this behavior does not happen..

 

Changing from 3D to 2D does not help.

 

Note: When in 3D the zoom is maxed out as well.