Google Latitude - anti-theft system for the price of a communicator + SIM cards

I understand that a cheap and affordable alternative to satellite anti-theft systems (satellite signaling) has appeared, such as Autolocator, Starcom, Caesar Satellite, AutoConnex, etc., which can cost several thousand dollars and require subscription fees .

An alternative could be Google Latitude . Of course, this applies only to search, so that the car is far from being hijacked, or if you have, then know where.

But, even if the stolen car is located in a place where there is no GPS or GSM reception, the coordinates of the place where it was last time and the route done will remain in Google Latitude, which can greatly facilitate the search.
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The cost of such a system is equal to the price of a communicator + a SIM card. In the simplest version, you can simply hide the communicator in the cabin or in the trunk. In a more intelligible version, it would be nice to remove the antenna and power the communicator from the car battery. Not bad, also take care that the SIM card used has a normal coverage area and roaming.