I am wondering if and how I can build a Bluetooth gps receiver that I can pair with my android phone to get better quality signal in the car.
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You can make it, use bluetooth dongle or the HC-05 Module for forwarding traffic of gps on pi to bluetooth transmitter.
so i guess you need a program which will manipulate the original gps values to usable and readble values
then send the value(gps manipulated values) to bluetooth.
Now either use UART(for hc-05) and bluez stack commands, you can use sdptool and rfcomm to make a bridge to send values to your phone.
modify this approch for better results .. ;)