Not sure if it works the same for individual trackers for private use but the company I work for has a fleet of vans that are all fitted with trackers. The main reason is to bring down the insurance price.
They show the van as a dot on a google earth style map and it's live, so the vans can be seen in real time.
It also shows engine rpm, what gear was used and when, engine temps, how long the van has been at addresses. It's all stored as well.
It's fascinating to look at the data. I can find out what tracking device is used and what software is used to view the data if that's of any use.