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I was faced with a similar issue as I have a globaltop g33 which has auto-off but not auto-on. I made a simple circuit using a relay, a couple diodes, resistor, led's and some capacitors. When the computer turns on, it flips the relay and turns on the BT gps receiver, when the computer turns on, the caps drain and flip the relay again and turn it off. USB cable plugged into the usb port for charging the battery when computer is running and the relay is connected to the on/off switch of the gps receiver.
I found the schematics on this site, but don't have time to search right now. If I get a chance later I'll do some searching as it would be your best option. That way you can have a 'warm' start for gps signal aquisition while not worrying about it staying on or not turning on.
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