If you don't have a WO on deck, you won't hear the announcements. However, if you are using automatic map updates, the contacts will be plotted to the map and your TC will drop.
To test this, try taking your WO off the conning tower the next time you leave harbor.
As for watch crew efficiency, it does not matter how many people you have up there as long as the efficiency bar is maxed out.
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"Well, now, that's true... the IXC is a bit of a chick magnet..but you really can't beat the VIIB for off-road fun."
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