Showing off? I doubt the grizzled and scarred programmers of PIC-assembler will be impressed by anything I can do with my Arduino board. However they might be jealous that a soft-skinned C-programmer like me can tread on their toes.
But since I'm showing off, here's a picture of the GPS-clock. Above 1kph it switches to display speed, but you'll have to take my word for it. As you can see, right now the mobility is rather limited. Testing involves waving the GPS around on the end of its cable.
The little bit of electronics in the background is to convert RS232 to TTL logic levels, and to switch the GPS on if no data is detected.