Get all Big Brother on yourself by carrying around the Trackstick II, a tracking device that logs your location at regular intervals using GPS. Once you’re safely home, whack it into your USB and it’ll show your day’s worth of meanderings on a Google Earth map.
Best for hiding it in a shady-acting friend’s car and then retrieving to see what they’ve been up to, or keep hold of it on a Friday night out to discover exactly where you got to when you’ve forgotten. The Trackstick runs on two AAA batteries which should keep it going for about a month or so. Get it from NAO Online for about £200.