I use Marco Polo for my MR (multi-rotor) aircraft. Basic RF no cell or https://secretstorages.com/best-hidden-gps-tracker-for-car/
required but range is limited. Open field I've tested it up to 2 miles (3.22km) but in a dense city environment it's much less. It really depends if it's buried inside a building or not. I've never tested it inside a car which may limit the RF even more. However, if it can see the tag it's extremely accurate.
They also offer an RC tag about 1/4 the weight (12g) of the pet collar tag (45g) but it's not water resistant and doesn't have as much battery life as the Pet tag. Battery life on pet tag is pretty good though - 30 days standby, around 3 days tracking when activated.
One cool feature is that it can monitor up to 90 days which means it will trigger an alert if the tag leaves a predefined boundary. There is also an alarm output so this opens the door for alarm alert followed by close-in tracking.