The Columbus nGPS allows geo-tagging on many Nikon and Fuji digital SLR cameras. Geo-tagging uses a GPS device to record your location into the digital image file from your camera. The nGPS device constantly monitors your position and when you press the shutter adds the location information to the data recorded alongside the picture.
The Columbus nGPS weighs just over half an ounce and mounts on the hotshoe, and connects to the serial connecter of your camera. Not only does it allow for the GPS positioning data to be stamped on your image files, it also has a wired remote shutter release.