There are GPS collars for dogs that would seem more directly related to solving the problem. I spoke to a guy the other night with one and he said it cost 6 eur

There are GPS collars for dogs that would seem more directly related to solving the problem. I spoke to a guy the other night with one and he said it cost 6 euros a month, which is going to add up. Fine for a dog, where you expect to loose him / her to an extent, whereas I assume you wouldn't expect to loose a bike.