I have been considering purchasing a tracker device for my new car in March, but know nothing about them. I have had a (brief) look at the tracker website and was considering getting the tracker retrieve until i read your post Teutonic_Tamer. Are these devices any good? which one is best? Also, do they track your day to day commuting or are they only active once the car is stolen?
If you are considering a tracking device, then the only product which is used by all 52 UK Police forces, all major UK shipping ports, and also covers certain European countries - then ONLY Tracker are suitable.
The RAC used to do a system, called TrakBak (I think), but this has no Police support, is operated by Group4, and they can't even keep hold of prisoners in transit!

IMHO, they are very, very good, but, they are not cheap. There are 4 different systems offered by Tracker, with quite differing prices. Only you can decide which one you want, based on a number of factors.
1. Is your car highly desireable,
2. Do you live rural or in a city,
3. Do you have a garage or secure parking,
4. Do you have secure parking at work,
5. Are you in an area (or frequently travel to) which is a hotspot for car theft,
6. Have you ever had a car stollen before,
7. Do you have a specific requirement from your insurer,
8. Are you a 6ft6" tall, 3ft wide monster of a bloke, or a 5ft dainty woman?

When you have weighed up the above Qs, then hopefully you should have narrowed down your options.
Regarding day-2-day general route tracking - the commercial fleet trackers have this facility, but the car (and motorbike) only "stolen vehicle recovery" trackers do NOT have this function. The car trackers are only "activated" and actively send out tracking data, via a secure centre, to the Police, only after confirmation of unauthorised vehicle movement is detected.

Any more Qs, ask away!