gps_compare
GPS compare currently takes in two GPS streams, one from a USB puck and another from a Bluetooth GPS dongle and saves both NMEA streams into separate text files for debug.
To connect a Bluetooth GPS module ( The GT-750 in my case ) to a Raspberry Pi, try the following commands :
sudo hcitool scan bluetoothctl
agent on pairable on scan on scan off pair xx:xx:xx:xx:xx:xx [agent]PIN code: 0000 exit
sudo rfcomm bind /dev/rfcomm1 00:1B:F6:A0:07:22