
My boss had a pair of navman units fitted to the two Isuzu bighorns we ran, they'd send data such as location, whether motor running or turned off, if moving the speed it was moving at... things like that.
One sales rep team leader was so addicted to the coffee that before a month was out the office knew the location of every cafe in the town he was working in since the truck would pull up there and stay there for 30 mins before moving off :D They could even program the computer at the office to warn them every time the motor switched of withing 500M of a logged location, so log in every cafe in town, and when the rep stopped for a coffee, he got a call from the office within minutes :D