Originally Posted by
gringo_gus
The biggest difference I see is that the OP is talking about a dynamic tracking device, while immobilise's bicycle tag is static. The dynamic tracking device emits a signal to a system of satellites that allows it to be tracked. It requires a power source (batteries) to send out the signal. The bike tag by immobilise contains owner information that can only be retrieved when a scanner is run over it; very much like the microchips inserted under a dog's skin, (no power and nothing being emitted).
Immobilise is interesting and might be effective, but it appears that only UK police have access to the scanners. I'm not sure how much well it would do here in America.