Turning On My Car GPS While in an Airplane

I always wondered what would happen if I turned on a GPS in an airplane. With all the warnings they give you during take-off, I expected the plane to explode or something. Instead, I found that my GPS (seemed to) work.
Ευχαριστούμε τον φίλο μας Λουκά Χριστόπουλο που μας το έστειλε!