Latest update: I purchased this
Powergen charger, which is supposed to be able to deliver up to 3.1 amps.
Tried it last night in my card running Google Navigation, and the batter STILL drained; slowly, about 3% over 45 minutes, but it was indeed draining. Wasn't running anything else except Google Nav; screen was on (obviously) and I did have bluetooth enabled and paired with my car's system, but I wasn't using the phone for calls.
Guess I'll repeat my request:
Does this happen to anyone else?
Any recommendations for chargers that WILL charge the phone while running GPS/navigation apps?