With the Pentax O-GPS1 GPS Unit attached to the hotshoe of your Pentax DSLR you can geotag your images with location information for mapping your photos on popular photo-sharing websites. Chart the progress of a hike, bike or boating trip with interval position tracking. A separate, but efficient power source will not drain your camera's battery. The unit supports terrestrial-based WAAS for highly accurate positioning and an electronic compass function assists while hiking or camping.