GPS
I used a Garmin 76 hand held with external antenna attached to the rear cockpit window of the 320. Worked most times.
I don't think the GPS can be called a "Blue Tooth" device. GPS is GPS, not BT. I would not allow anyone to prevent me from using it as a back-up in the cockpit. GPS has all you need to save your skin : ground speed, heading and altitude (true, not pressure alt). Many pilots and passengers would be alive today if the crew had a GPS unit with them when all others failed.
Unfortunately the shielding in electronic aircraft can cause reception problems, but the external antenna placed at a certain place will help. You just have to play with it to find a good spot.
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Last edited by thermostat; 19th Nov 2012 at 21:37.