I've had and it is fun as heck.
You pretty much assume that Navigator is unable to determine course (because whatever numbers he is crunching in dead-reckoning show absolute garbage) and you do what Steve said: if the storm is really bad: you very carefully waiting it out, usually below the surface, maybe drifting a bit, maybe moving at a very low speed..
If the weather is not that bad, then you try to find landmarks and identify your location.
One thing I wish the Navigator could do is to base their calculations on the landmarks. From another stand point of view: once you have an incorrect location mark from the navigator, you can manually position it based on your own visual observations.
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