MAMBA F722S in combination with BN-880 Compass over I2C

[dude2k]

I have a question here about a more specific problem/case and hope you can help me with it. The goal is to put the GPS BN-880 incl. Compass in operation.
However the Compass runs as I2C.

I use a MAMBA F722s to which so far the following components are connected:

• UART 2 -> TBS Crossfire
• UART 3 -> TBS Unify32 (TX3 only)
• UART 5 -> GPS

So theoretically free would be the following UART's:

• UART 1 -> Labeled as SBUS
• UART 4 -> Labeled as Bluetooth
• UART 6 -> Labeled as TELE

Regarding UART 1:
RX1 is not labeled,. Is the port SBUS in this case RX1???
TX1 is in second row behind PPM

Regarding UART 4 and 6:
Both seem to be hard wired internally, is there any way to use the ports anyway?

I already tried UART 6, but got no signal from the Compass.

[dude2k]

Already solved, problem:
Moved VTX to TX1 and added Compass to TX3 and RX3
Also had to change frequency to 400Khz instead of 800Khz