ZGR-1 Nikon GPS unit and timer remote control is a accessory for iOS device (iPhone, iPod Touch and iPad) and Nikon DSLR camera that send GPS data (latitude, longitude, altitude, and UTC Time) from iOS device to camera with photographs, and with a built in interval timer, it will help you control your exposures. This app has been tested on iOS6, had a few bug fixes and improved compass. This is a free app and therefore a free update. Click here to download.