Another couple of GW problems.

[Phobus]

Two questions

This is my first GW patrol.

I found a freighter on my first patrol a (C2) and hit it with two torps (set magnetic 2 mtrs below draft). It slowed to two kts and I thought it must be sinking so I waited for a hour then fired another torp. I waited for another hour and although the target had lost all speed it didn't seem to be sinking. Eventually with a warship closing I fired a fifth torp and dived.

Now my question is this if I don't see the target sinking how do I know if it will. It may well be that it would have sunk after 3 torps. I couldn't use my gun to finish it off because of the weather. How long is it reasonable to wait given that escorts might approach? What was the real life solution?

And finally the key functions in GW seem to be different to the basic game. I caught a small freighter in calm seas but after manning the deck gun couldn't get it fire. Space bar inoperative. Tried all the keys I could. I couldn't find anything in the options so wonder if there is somewhere else I should be looking.