I packed my Nuvi in my laptop bag, and out of boredom on a night time flight from DC to California (I had a window seat), I turned on my Nuvi 350 and held it against the window with antenna opened.
To my surprise it locked on, and started giving me location, speed, altitude. It even had a 'mode' where it somehow knew I was in a plane as it did not allow 'directions' to be queried. Kind of fun to watch the altitude during descent.
My 'max speed' locked in at around 530 MPH - I showed it to my son a week later, "look how fast I was driving the other day"......
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