Hi @rjmickle -
Bluetooth is not currently supported, but it could definitely be a useful feature for BlueOS! You’re correct, Serial2 is normally what is used to consume NMEA data with ArduPilot.
Can you share more about the GPS you have in mind?
If you’re able to connect to it manually using the Raspberry Pi Bluetooth radio from the terminal (after taking the red-pill), you could likely accomplish your NMEA streaming goals as well. Getting things to auto-connect with bluetooth can be tricky, but it should also be possible! The third post in this thread goes into detail on how this may be possible - if you’re able to see NMEA data in a minicom instance then you’ll be almost there!