[XenonSurf]

Ultimately what counts is the overall bar amount of a station, e.g. if the the deck is filled with green almost to the right, it means the watch men are in sufficient quantiy and quality (if you put the specialist officer on it) for best performance in spotting enemies. At night, man the deck with only 2 crew men without specialist, that's enough because there's also the sonar man to spot near contacts.

The same goes with other stations, man the torpedo rooms with enough crew to speed up torpedo loadings.

By clicking on a station's bar you automatically fill it with the optimal nr. of men to do service in it, also there are preset tabs for normal service or battle stations to chose from.

Then, watch the individual bars of a crew man for its endurance, if it goes low it surley needs to rest for some time, however in WAC I don't see this often, maybe after an intense battle with evasion. If you change the crew positions often, no one will 'suddenly' be stressed. I think (not sure) in SH3 Commander you can set the fatigue behavior of the crew, you would then need to launch game from the Commander.

Put men at rest in the compartments next to the command room (left & right).

These are just normal guidelines, there's not much else to it I think, except that you can get more crew members to join your sub at the cost of renown points (when in port obviously).