Here’s a relatively inexpensive, yet very inconspicuous magnetic GPS tracker that you can hide on your car to keep tabs on your no-good kids and/or your no-good spouse.

The Driving Activity Reporter from Hammacher Schlemmer sells for $229, runs on two AAA lithium batteries good for three weeks, and uses a 16-channel GPS receiver to log up to 100 hours of driving activity.

Best of all, it’s compatible with Google Earth so you can ooh and ahh at all the 3D buildings in your town as you find out that your better half spent the night at a coworkers house.

The Driving Activity Reporter [Hammacher Schlemmer via TechFodder]