I honestly don't think it matters, the crew doesn't have directional sighting per say, more like visual value for certain ranges. I have never noticed a sight difference regardess of crew ratings, main thing is to leave the watch officer in his slot. I also think they see as good no matter how tired they're, unless they fall asleep. The crew efficiency ratings don't seem to be implemented in the game as well as they should be and the numbers can go all over the board, often not making sense...However, morale and health seem to have more of an impact.
My guess is efficiency ratings don't have much impact unless they get fairly low, above a certain level it doesn't matter....
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