DIRECT ANSWER
Bind a single pedal axis to rudder, confirm the bridge indicator centers, invert it if direction is wrong, and add only enough deadzone to remove drift.
Calibration check
Test in open water before entering a harbor.
- Pedals centered: rudder indicator centered
- Left pedal: verify expected rudder direction
- Full travel: indicator reaches both limits
- Hands off: no continued drift
- No second device bound to rudder