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Units like the Nikon GP-1, DawnTech di-GPS or others are a full GPS receiver. They connect to the camera's serial accessory port and send a NMEA 0183 signal to the camera. When the shutter is pressed the camera reads this latitude, longitude and (in some cases) altitude and writes it in to the EXIF data of the image file.
ok so to save me googling what reads all the exif data, I know windows reads some of it like resolution date and camera info but what reads it all?
(sorry for the hijack DB)
Basically what ever needs to can. For example iPhoto 09 (and Aperture 3) can locate an image on Google maps using the Lat/Long, Flickr and Picasa can also do this as can other software.
When you view EIF data you are just seeing what is embedded and it also depends on whether the viewer shows you everything or only what it knows about.
Sorry werdan haven't used it yet, was going to take it camping with me this weekend but as we left late fri after work, when I picked it up I then found out it needs a 2hr charge from a usb port.......
So left it this time but will get it up shortly :)