No, I think 60-70° will be sufficient for game purposes. Using real nav further up to the north doesn't make much sense in the game because of the distorted map. It looks like a mercator at first glance (which would be of great value in navigation), but it isn't! In real life, something like 180° are required, though.
The problem as far as I understand it is the fishbowl effect that throws off any reading by some margin. If we could move the object of interest (i.e. Polaris) into the center of the FOV, this problem wouldn't exist any more (I think). The binocs might be useful for this. In real life, the navigator has to align the sextant with the horizon manually, but in the game this is hard to accomplish, distorts the view and limits the readings to a maximum of 60°. By shifting the view upwards, we might be able to achieve more precision (we are currently in the weird situation that determining the longitude is easier and more precise than the latitude).
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