[blackdog]

Or build a shielded enclosure to place around the box, say to about 100db. It will transmit to nowhere. Take it off once a month just to be inventoried on your trip to the grocery store.

[Larry Lucido]

Maybe a jamming device? Ya gotta be able to hide it on those roadside checks though - you know, for the children.

[TheFrog]

Only works if the gps and its associated computer do not interface with the on-board diagnostic unit, speedometer and a gyro. If the any of the signals is off by a precalculated amount the computer simply disables the vehicle.