Originally Posted by
MinEng
The GPS idea probably wouldn't work, though, as GPS generally does not work indoors. A terminal map, however, would be fantastic!
GPS works anywhere you have a signal. While it might not direct you within the airport itself (it's not that specific on the 3G, though the 3GS has some impressive capabilities in that direction, check out the NYC subway app for an extremely impressive app that uses the camera function to display pointers to the nearest subway locations), it can easily extrapolate "here is the nearest airport, and here is the information related to that airport", much like applications such as Yelp will take your current location and point you towards restaurants with their ratings.