GPS Tracking Stick
GPS tracking devices use satellite signals to keep track of where someone has been anywhere in the world - of their exact times, locations, altitude, direction of movement, and speed of travel.
This TrackStick is about the size of a pack of gum, and can be unloaded into your computer via a USB port, operating for up to 7 days on just 2 AAA batteries. It will output it's information in RTF, HTML, MS Excel, or Google Earth KML formats.