Don't know of the current wisdom for operating within an aviation environment, but if it is OK to do so, then your Bluetooth GPS would get some blanking from the front elements, but would work nicely in side or eyebrow windows.
Several modern cars have a film heating element in the windscreen nowadays,(mainly Ford in UK I think) and the GPS signal is greatly attenuated. Answers here, include either chucking it in the glovebox, which seems to work, or a discrete external aerial. (I use a Fortuna clip on and have been very surprised how well it keeps lock)
I really would check the advisability of using when airborne though...
Conan