The Marrex GPS-N1 is designed to add geotagging data to any shot you take with your Nikon camera. By geotagging your images with latitude, longitude, altitude and time information you'll always know exactly where and when all your photos were taken.. Gain additional flexibility and functionality through the built-in wireless remote trigger. Incorporated into the GPS geotagging unit itself - the wireless remote trigger allows the camera shutter to be tripped from up to 30 feet away. Accessory cable and remote are included with the GPS unit. The GPS-N1 is compatible only with select Nikon cameras.