The simple fact is that submarines are smaller and lower in the water than the ships they stalked. Though it ocassionally happened differently, for the most part the u-boats spotted merchants and destroyers at night long before the merchants and destroyers spotted them, and the night surfaced attack was considered the best way to do it until the coming of radar.
Quote:
Originally Posted by Hanomag
What the heck is WAC? 
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War Ace Campaign.
http://www.subsim.com/radioroom/showthread.php?t=128050