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The Redhen D2X-GPS uses a bluetooth-enabled GPS unit combined with Nikon D3X, D300, D300S, D800, and D800E to directly capture geographic referenced images. It has been the easiest, most reliable collection method. The Redhen plugs directly into the 10-pin connector on front of the camera. It uses limited amount of power from the camera to operate its Bluetooth radio and connects to Bluetooth GPS in close proximity.