It just depends how it's administered, it can be a very productive tool or it can be used to spy on field techs and cause distrust. I worked for the local dealer in Phoenix Az. that had a GPS system installed into all field trucks, right away all the Tech's were against the idea, they thought management would use this tool in a negative way, they turned out to be correct. The Gps units were used for everthing except dispatch, the tech's would attempt to disable the units or just ignore it. This is an example of how not use a system like GPS although used correctly can be very a productive tool. One last comment, at any dealership Management should be used in part to support all Tech's field & shop so they can properly service the customer, most often they end up supporting managemnet, think about it!