CATSeye Tracking Systems claim 1-inch accuracy

From Engadget, by Paul Miller

If you're tired of your "buddies" swiping all your tech whenever they come over for a bit of Halo, you might be interested in this new CATSeye GPS/GSM/RF tracking system for hunting them down the next time it happens. The matchbox-sized transponder device can be slipped into an item (above it's sitting inside a TomTom GPS unit) and then tracked via the CATSeye system. Device coordinates can be set to send at a regular interval, if the unit is moved (there's a motion sensor inside as well), or if it's taken outside of its assigned "geo-fence." The system mainly relies on GPS for tracking duties, but it can give GSM tower coordinates in a pinch, and a separate RF scanner can locate the unit with up to 1-inch accuracy. We're not quite sure how much the rest of the system costs, but the RF scanners range in price from $100 to $1000+. At those kind of prices the system is really best suited for keeping store inventory or for tracking items given to enterprise staff, but we still think the revenge angle is...