Nikon’s GP-1 GPS Unit can add geotags to your photos so that the latitude, longitude, altitude and time information can be noted. It features 3 blinking lights for satellite receiving indications and gets its power from the camera itself. It takes about 45 seconds to record from a cold start and only 5 sec. with a hot one. The GP-1 is compatible with the Nikon D90, D3, D300, D700, D2Xs and D200, although some may need a cable and firmware update. At a size of 2 x 1.8 x 1-inches, pre-order at J&R for $209.00.