The GP-E1 is a GPS add-on that draws its power directly from the body, so there's no extra battery to stick in it. It has an electronic compass that keeps track of your latitude, longitude, elevation and the Universal Time Code. Later, you can browse the camera data on a computer, including info about which direction the camera was pointing. Like, the WFT-E6A, the GP-E1 is dust and weatherproof. It'll cost $300 when it shows up in April. 2012.