There are a huge number of GPS products on the market for all sorts of purposes. For example there is a specific subcategory of GPS products tailored for vehicle tracking and surveillance- in other words, tracking a car, a fleet, or any other automobile (hey you could even track a boat, etc).
Certain product lines are sold only through authorized dealers and distributors- these are generally the higher end GPS units used by heavy industry or car rental companies.
You can consider GPS car tracking as a branch of security as well as something that can help fleet management companies or car rental facilities, etc, to manage their operations more effectively, cut costs, and find out who's slacking on the job.
Back in the day, the primary security method for your vehicle was to have one of those annoying sounding alarm systems. And more recently the security bar we place on our steering wheels when parking. Well now for those extra paranoid folks out there you now have the option of using GPS tracking in case your car ever got stolen.
Or you could always pretend to be James Bond and follow your kids around to make sure they are not falling into the wrong crowd. Those are just a few possible things you can do. It's up to you to decide what you are looking to do.
The truth is, the global climate of security is not what it used to be. Therefore the sense of having an extra peace of mind can go a long way in these uncertain times.
Please note that not all GPS offerings will be the same- depending on the extra features you are looking for, and whether you want a third party to monitor and track you vehicle or even fleet of vehicles, there may be a subscription fee involved someplace.
http://www.nz-electronics.co.nz/supplies/article_info.php/articles_id/51?osCsid=...