I am a Contractor and installed GPS in my truck. In the last few months I have had to go out of state a few times.
Shortly after I installed Vehicle Track I had to fly to Michigan. I got my laptop out and tracked my truck, which was 15 miles from the job site. I two-way radioed my foreman and asked him what he was doing. He stated that he was on his way to lunch.
I then asked him what he was doing driving 15 miles from the jobsite and I told him I knew where he was at. You could almost hear crickets chirping from his silence. He then told me that he and a couple of other employees were on the way to my bank to cash their checks (at my expense, wages and gas 12.5 mpg).
That does not happen anymore with them knowing that I am keeping track of their driving time. I know when the truck leaves in the morning, when it leaves the jobsite, and when it returns for the day. Plus, I get a weekly report of miles driven for the week.
As a contractor, this system is one of the most important tools you can have.