I know that the compass gives the correct absolute heading of your sub. But the matter cannot be solved that easily by correcting the course once a day because of the thing that Hadrys said sometimes he got off course by 60° (I assume he meant in far less than a day).
Also if you correct an error of 10° in your course by 10° in the opposite direction you want to travel you produce even more error because the course changes slightly over time and not abrupt all at once. But I don't know how big this error would be in the last case this might be the smallest problem overall.
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