Originally Posted By: andy
You can't use an iPod touch for navigation I'm afraid, it doesn't have a GPS.
Somebody used to sell an add-on module that added the GPS receiver, as I recall. Probably better to repurpose an iPhone, I suppose.

Hmm, at one time I actually owned a Magellan car mount that had its own GPS receiver which fed into the iDevice connector. Sold it a while back...

http://gps.about.com/od/mobilephonegps/a/iPod-Touch-GPS.htm