The issue, as 52 telecaster points out, has always been battery life. If someone cannot find your bike within a few hours, the device will run down and be useless.

The trade-off is range versus lifespan. If the transmitter has city-wide range, it won't last long, but if ti doesn't .... not many people are going to steal a bike and park it on the next block while they hang with their friends.

The other issue is police involvement. particularly in Ukraine ... are police likely to spend a lot of time and energy tracking a stolen bicycle? I don't know. If you can pinpoint the location, it really doesn't matter unless a cop will accompany you.

Easiest way to keep your bike from getting stolen is to take the wheels with you .... but some people will still steal the frame. At least they won't ride off with it. professional thieves have the tools to defeat any lock, but a really good lock takes a lot longer to cut through, and if the bike isn't really valuable, the risk/reward ratio might be in your favor.

If you can make a small GPS transmitter with a couple days' battery life and a ten- or twenty-mile range, it would probably sell the world over.