Trubleshooting with Dashboard 1.2

[Rhaxabulle]

The relative wind speed and angle indicator shows a wind direction 180° false (opposite direction).

Could somebody help?

[seandepagnier]

The dashboard only shows the wind angle it receives from nmea0183 messages. Depending on the sensor, you might be able to realign it with a set screw.

[rgleason]

If it is Raymarine, you should look up the calibration routine, how to get into setup mode and adjust direction and calibrate. For Raymarine you must do two circles too.
If it is another instrument, you will also need to look up calibration.