interresting, a tracker system came with the purchase of my insurance. I was very surprised at how accurate the system is, showing me all sorts of data by logging into their web site like:
avg. speed travelled per day/month/year
exact time within seconds when car was started/stopped
It uses Google to show were exactly I have travelled and were the car is at any given time.
To this day I have no idea were exactly they installed the tracker and what the damn thing looks like, but at least I know its working as it should.
Negatives about it is, I can't go race my car around a track without the inssurance knowing were I have been, which in my case doesn't bother me mutch