Smack in the middle of the arena of self-surveillence is this tiny flash-stick-sized location tracker, the Trackstick. It is tiny. Gets lost in your coat pocket, or backpack. You carry it around wherever you go. Once a month you download its records from its built in USB port and plot your course on an online mapping service, like Google Earth.
The device has no display and its small AAA batteries are cheap — but they will last only one week. You can find a Trackstick II for about $180 at Google Earth store. I have not used one, so can’t verify how well it picks up satellites in your pocket.