It's not really surprising... Imagine that, you are caught in a storm, not the most terrific one, but a serious, wind speed 15m/s which is equal to a 10 in Beaufort scale, with a surg of 7-8 m. And you have to keep the course on, say, 0°... but the wind is blowing straight port, and so is the surg direction. The ship will easily show a helms compass moving from 355 to 05, and you will try to keep it in the average position.
Your speed is slow, 7-8 Knts, with sudden acceleration and short braking when the fore hit the wave, the ship isn't really well responding to the helms.
This is modeled in the game by a 1-2° drift per hour for an average distance of 31-32 km, which seems very close to the reallity. I don't think that high TC (I mean 256<, never play above) have any influence on that. But for sure if you let her go for 15 or 20 hours in a raw whitout giving any corrections, you can easily be out of course for 30-40°.
Major rule for the RealNav navigator : in a storm, stay on the bridge, or you will get lost.
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