JOhnH
Touchdown! Greaser!
I never lost GPS with my internal GPS on the MAXiPAD 2. It may be the way you have it mounted or it may be that the high wings do block some of the sky for the unit.
I do not have any problems with the internal GPS in my 172. Except that since it is not mounted so I am frequently putting it away and getting it back out. For most things the 530 and the 496 are more useful because they are always in the same place.