GPS at the work place

About 6 months ago the company I work for decided to install global positioning systems on our work vehicles to maximize productivity. At first they indicated its was just to be able to find us in case of an emergency. However that changed in about 3 weeks when one employee was reprimanded and then another. It does tend to make you more productive, but it is a real anoinance knowing that they can watch every move you make with your vehicle. The speed you are going, how long you are at a job site, and it even glows red to indicate you are at a certain location, like your own house. I go home for lunch and my supervisor said it was ok as long as the vehicle started moving before lunch break was over. You never can be sure each day if you will be disciplined for making a wrong move, you are really at their mercy.