Personally, I find it impossible to even venture a guess as to what my location is just by looking out the window at cruising altitude. It becomes much easier d

Personally, I find it impossible to even venture a guess as to what my location is just by looking out the window at cruising altitude. It becomes much easier during final descent, but it still requires familiarity with the location. In any case, an attacker will have nowhere near the precision provided by GPS. Passengers, beyond curiosity, have very little use for GPS during a flight. When I'm on a plane I could really care less what my location is. I'm more concerned with how much longer I have to wait before arriving at my destination. The parts of the security directive that bother me most are the restrictions on access to carry-on belongings and items on your lap and not being able to get up from the seat.