That's not what Navigators do!
The helmsmen stand by the helm; possible multiple while in a storm.
There would be an "officer of the watch" standing there though and there'd be only one of them in charge at the same time.
I'd assume there might be an assistant too, but only if that is a Midshipman/Cadet.
While on modern ships there can sometimes be a Senior and Junior officer on watch (oh, the memories!!!), I doubt that would be common practice back on the days.
The actual "Navigator" would probably be the Captain or First Mate and all that would mean is that he prepares the "voyage plan", e.g. the route to sail.
A Navigator would also check the position (using the stars while at sea, otherwise using bearings to known points on the shore) and order changes to the voyage plan as required,
for example if the ship had drifted away from the intended track.
Of course the game as it currently stands does not replicate this sort of logic very well at all.