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Simple fact- the vast majority of drivers are never more than about 200 yrds/mtrs from their cars. At home, at work, visiting friends, at sport, cinema, shopping- your car is usually pretty close.
So how about a simple single frequency FM transmitter hooked up to your car ignition or existing security
system, that transmits a warning beep to your receiver/keyring. The transmitter need not be powerful, expensive, or versatile- just enough to send you a warning. You might just have enough warning to do something about it..
This is not like those fancy mega-thousand$$$ Global Positioning Systems the likes of BMW are trying to sell..
[link]
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