Sometimes, photographs are taken with absolutely no recollection of exactly where they happened. Thankfully, Sony realized this common problem, and decided to do something about it. Using a process that Sony calls “GPS Tagging”, the little device phones home once every 15 minutes, allowing you to effectively track yourself. You can also hook it up to your compatible Sony camera/camcorder to embed your location/the time into your pictures and videos. With 31MB of memory, it can store your trail for up to one month before needing to be emptied. It runs off of your ordinary AA batteries, which Sony claims gives it ten hours of life between charges. It should become available next month for roughly $150USD.
Source : Reg Hardware