Will the screening devices at the airport harm a GPS device?”
Airport screening devices are safe for most electronics, including cell phones (which have GPS chips), laptops, MP3 players, and digital cameras. The only thing you need to worry about is undeveloped or unexposed photographic film. The X-Rays can penetrate the packaging and fog it. http://www.tsa.gov/travelers/index.shtm is the Government’s website for addressing concerns about carry-on baggage.
