[villagetinker]

I did a little research on these when it was reported about all the thefts. It appears that a GPS tracker requires Cell phone service, and a monthly charge. A more practical approach maybe a motorcycle (or car) alarm system. Many of these have a radio link to your remote which would alert you to a problem, you can then call the police. There are blue tooth options, but these require people to have installed the app on their phones, and these have very limited range.
IMHO, a really noisy alarm, and the radio based alert should keep the thieves away from your cart. This was also asked on the experts section, and if I recall, the expert had indicated that he was looking for a good unit for the electric carts, there was no mention for gas carts.
You also have the option of replacing the key with one that is individually keyed, and a hidden switch to stop starting the cart.
Hope this helps.