Ok my experiences: I've recovered many bikes and cars with tracker fitted. Actually it's more bikes than cars, but cars are easier to locate. There are many different types of devices, however the Police tend to only have the Tracker (actual brand) receivers. This is only a basic device (receiver) but it works surprisingly well and is how I've got some amazing results. This is the only brand that most forces can actively track with no outside assistance. I won't go into procedure as that's not for open forum, but all I can say is it is very effective. The other types, road star etc are effective but most of the time they are 1 step behind, in the owner has to track themselves and pass the info on (or a call centre) and by the time the info gets to ground units we are behind and playing catch up. Tracker used to have equipment on most big police buildings in London, and even a receiver on the Helicopters. This was a good time for us, but due to cost cutting they have been stripped and tracker equipment in London is limited to Traffic and area cars. Not sure which cars get tracker equipment in county forces. I have been thinking about going for a tracker, but part of me is thinking that if its stolen I'd probably never want to ride it again after some mutant piece of shit has had hold of it.