A pigeon on a string…attached to your car…homing.
This is the idea of a friend of mine. He came up with it after we’d had a few glasses of champagne.
PROS: novelty factor, comedy value
CONS: you wouldn’t be able to exceed the pigeon’s maximum speed, you could only set it for one destination (home)
VERDICT: does not translate into reality. Could work better on a bike or horse and cart though – something slower.