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If you can build a simple circuit (sorry, I didn't take notes when I did it or I'd share them), you don't have to spend $17. All you need is a Maxim MAX232 chip and 4 capacitors. The capacitors cost maybe 10 cents each and you might be able to get a free sample of the Maxim chip.
The Onstar hack is cool, but if you're happy with your gps mouse, I wouldn't waste my time...
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