Oh I hear ya, I been on this one quite a spell and only found one so far. There have been many merchant ships pass through and I've had to pass them up unless by deckgun cause I cant waste torps on them as I'll need them for these warships.
The one I did bag I nearly didn't get him due to the weather and heavy seas. And I learned my lesson to pay attention to whether I have salvo selected or not too...........
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Wasted three fish on that guy cause I only ment to fire one more at him after two weren't enough. And I think it might have went down with the first two but I didn't give it a chance to. But I was gonna lose him if I didnt fire as he was too fast to catch up to in this sea.
I've been repsitioned twice, and on the second order to reposition it didn't set a new area, and indicates objective complete even though the indicator bar is only 1/4 full.
Early on when I first arrived up here I wasted three fish on a merchant cause I didn't know better about the type of ships I was after since then the objective only said "sink 5 ships" with no indication of type.
Now down to five fish left, and thats not gonna be enough so will have to go back and reload to finish up.