Sometimes the best defense in a strong offense. I generally try to avoid them, but if I'm detected, depending on the circumstance, I'll take him on with a "down the throat shot". This takes some practice, but I'm successful about 85% of the time doing this.
1) Lock on to the DD with your scope.
2) Go to at least standard speed, faster if you need to turn more quickly.
3) Put him at zero degrees in front of you (head on)
4) Set from your compass (lower right hand screen dial) to make small rudder adjustments. Once you get him to zero degrees, you shouldn't need more than about five degrees of rudder to keep him in the crosshairs. DO NOT use full rudder or you will over correct.
5) Use the small adjustments to keep him at zero degrees.
6) Make sure you have your bow tube doors open and set up for a zero degree gyro angle shot (i.e. straight in front of you)
7) Set depth as shallow as possible.
8) When he gets about 800 yds from you, let it rip.
9) If he starts a zig-zag, you have two options.. (a) fire one tube just to the left of his bow and immediately follow with another to the right of his bow. One of these is bound to get him. (b) practice until you can anticipate the time of firing to hit him in the side with one fish. this is risky !
Often you will be able to hit him before he starts to zigzag. The best insurance and also the way I'd do it in real life, would be to fire two, as in real life, we don't get to load a save and get a do-over. It is kinda fun using this technique, but again it takes practice. Once you get it down, you don't fear them as badly. I usually feel I have a better chance taking them down, than to let them get on top of me and hope to evade them and it's much more rewarding. Give it shot !
