I checked all the maps I have (Caucasus, Persian Gulf, Mariana, Syria, Afghanistan) all have the same error. In addition, when setting the direction with the knob, there are large discrepancies between GREBIEN and the course set with the knob, e.g. I set 120, GREBIEN shows 60, I set 100, GREBIEN shows 30.
On the second helicopter flying right next to me, everything is fine.
Does anyone have any advice?