Nobody has said much about capital ships. I've had great success with my tactics and actually sank 5 battleships and a carrier in one patrol in my current campaign. If there's no fog and you are lucky enough to get in front of the battle group, set up about 1500 meters off their path (on their port side). Fire on the lead BB when it reaches 3300 meters (fire two keel shots as one will likely detonate prematurely).
If you hit the ship, the other ships will begin to zig-zag to port bringing them closer to you. Don't move and keep the scope down until needed. When the ships cross your bow, you will be able to shoot impact shots. I've been able to sink or cripple an entire task force this way. The escorts will prosecute and eventually steam off, leaving the crippled ships behind. You can then go back to P-depth and finish them off.
If there's fog, you have to do the same thing only position yourself to be within visual range, fire the first shots at 1000 meters (they will find their mark), and be ready to shoot the rest visually from the bow or stern depending on how things unfold.
scrapser
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