Cheap GPS
Permanent link to this comic: http://xkcd.com/407/
Image URL (for hotlinking/embedding): http://imgs.xkcd.com/comics/cheap_gps.png
[[Guy driving down the road, with a GPS reading "COLD"]]
GPS: COLD... WARM... HOT! COLD...
{{title text: In lieu of mapping software, I once wrote a Perl program which, given a USB GPS receiver and a destination, printed 'LEFT' 'RIGHT' OR 'STRAIGHT' based on my heading.}}