GPS tagging your bike
Strong bike safety starts with a good bike lock (we recommend the Kryptonite New York 3000). However, even the strongest of locks can be beaten by determined thieves. So what can you do to recover your bike if it is stolen? A device a thief will never find The answer may lie in GPS devices. [...]
Source: http://www.londoncyclist.co.uk/gps-tagging-your-bike/