[DG] [DG11] Windmeters are not pointing in correct direction

[Supermart]

Hi,

I am the proud owner of a used boat that is equipped with Raymarine ST290 instruments. I have 2 problems:
1. The analoque windmeters do no not point in the correct direction although the windvane in the top of the mast is in the correct direction
2. Both the apparent and true wind speed are not correct. When I change course the wind is increasing or decreasing according to the windspeedmeter although the windspeed is stable.
I tried to adjust the windvane in the system while using the engine with a speed of at least 6 knots. Then for a couple of hours the system works correctly before the pointers change again to a total different direction.

Your help is appreciated!

Best regards,

Martijn