On a similar note, have a look at this New York Times article from earlier this month, which talks about people who use their GPS units to create drawings from the traceroutes of the paths they take. For example:

Pedaling the rectangular city blocks in San Francisco, Vicente Montelongo, 32, a graphic artist, realized the street layout lent itself to the pixeled shapes of vintage 1980s video game characters like Pac-Man, Q*bert and Donkey Kong. Back home with a printed-out Google map and a pencil, he drew Pac-Man chasing a ghost over in the Sunset District and then set out on his bike, iPhone in tow, GPS mapping application on. After riding 8.6 miles in an unwavering line, he uploaded the GPS track data from his phone, and had his picture.

Via googlemaps.

Previously: GPS Drawing Maps.