Powered Tracking You Can Build Yourself - The Arduino Powered Car Tracking System uses a Arduino Uno, a GSM shield, a GPS module together with a few other parts and has been design to powered from the cars battery.
Reviving my 40 year old Revell track - Page 3 - Slot Car Illustrated Forum
Build Your Own GPS Car Tracking System
We can use GPS in our phones to track them if they're ever lost or stolen, why not do the same with your car? You could go out and buy LoJack or OnStar, but this DIY solution uses an Arduino Uno, a GPS module, and a GSM shield to send you text messages and updates as the car is on the move.