I know for sure my handheld Garmin works at 27000 feet, at 530mph... ...I was actually surprised it worked up there.
It made me wonder what the actual limits are.

On 1/30/2013 12:00 PM, time-nuts-requ...@febo.com wrote:
How to check if a GPS works at 60,000 feet: send up a  balloon:

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