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Regarding batteries - you should have some in your devices in case they ask you to turn it on to prove it is what it is. They made me do that with my camera once and the batteries were dead. Luckily I had a spare set, swapped them out and turned it on, and they took the dead ones.
DNFTT! DNFTT! DNFTT!
"The funniest thing about this particular signature is that by the time you realize it doesn't say anything it's to late to stop reading it..."
The last few years, I've had my GPSr on every flight, fun to track. Keep in mind that most (or all, not sure) GPS units use pressure altitude, so it shows the "apparent" altitude in the cabin, not your actual altitude. Mine usually levels out around 6500-7000' even when we are over 30000 feet. You can still tell when you start to descend as they start adjusting the cabin pressure to line up with ground elevation.