This is just a simple application to experiment with GPS and serial display. The stack-up consists of a GPS module, a GPS shield, a double-tall ExtenderShield, and 7-segment serial display. In the photo, the flash washed out the LEDs, but this display is really bright (with digital dimmer options, too). The setup worked better than I expected. The GPS even got a location fix from my basement. This was one of the few projects where everything worked pretty much the first time, and only took about an hour.
... I'm thinking this would probably not be a good project to ship over seas right about now.