Obviously, GPS systems can be used to be a watchdog for those that like to abuse the privilege of being a road tech. GPS tracking is also used to track sales folks via company supplied cell phones. If you don't abuse it and give an honest days work for an honest days pay you should have any worries. If you worry about it then you need to worry.

There are benefits to using GPS systems - a few are:
1. Faster recovery of stolen service vans (not an uncommon occurance) with techs tools & all the other stuff before they find their way in a pawnshop. There is a lot of $$ tied up in those service vans.
2. Improved response times to customers needs - customers and their cash are kings in any business. Can be a competitive advantage to your company to gain additional business.
3. Yes, it is not uncommon for a company to have "slackers" in any part of the organization. Those on the road are harder to keep up with. They affect all in they company - meaning others have to carry more load to make up for their lack of productivity. Those folks can be weeded out quicker. With positive documentation the process is much easier. I like to get paid for what I do - seems fair.