We got a new USB GPS tracker(from Mobile Action, GT100) and had to try it out on the trip to Korea. It worked very well compared to the other devices we had so far. It got the bus trip in Düsseldorf airport right and the entire flight from Amsterdam to Seoul. Tracking worked well in the taxi from the Airport to the hotel. While walking in downtown Seoul it still performed OK (given the urban canyons) with some outliers.
It did not get any signal while we were on the Fokker-50 from Düsseldorf to Amsterdam 🙁 I slept a few hours on the flight to Seoul but I think someone took a photo (probably of me) over Mongolia… If you wonder if it is allowed to used your GPS in the plane or not – it is – at least with KLM (according to a random website http://gpsinformation.net/airgps/airgps.htm 🙂