There are 5 sub-types of GPS trackers available, those are Bluetooth, OBD, Satellite, Wired-in & Wireless.
A brief description of each is as follows:
Bluetooth: Small, convenient and cheap trackers which have a limited range of 100 metres, perfect for keys & wallets.
OBD: Limited to connecting to your vehicle’s OBD port, gives you indepth telematics about your vehicle but provides next to no theft protection.
Satellite: Rather that relying on mobile coverage, these trackers work nearly anywhere in the world. Although they’re much higher priced.
Wired: These trackers have little to no backup battery so they connect to your vehicle’s battery, they’ll give you more information about your vehicle, but if found, are easy to disable by thieves.
Wireless: The best option for easy tracking as no wiring is needed, so there’s a lower chance of a thief discovering your tracker.
The above list is just covering the various types of GPS trackers and you can easily see the different applications for all.
An OBD compared to a satellite tracker would be terrible to track a hiker but would be great to get loads of information about your car.
Learn more about the differences between the GPS tracking types here.