Richard has a review of the GlobalSat DG-100 GPS data logger, which can be used for geotagging (if the clocks on the data logger and camera are in sync). And presumably tracerouting. He also compares it to the Sony GPS-CS1, which he reviewed last September. “The software is a bit more complex to use than Sony’s, so it may not be good for novice or inexpert computer users, but it offers many more features. The Globalsat software does not offer photo geocoding, only location download and mapping; you will need additional software to map your photos.”

• Buy the GlobalSat DG-100 GPS Data Logger at Amazon.com
• Buy the Sony GPS-CS1 at Amazon.com