1. By 300 meters, it is armed.
2. If you have it on magnetic, the impact is still in place and should go off, depending on angle, when striking the ship. I am not sure how deep you torpedo ran during this question nor the type of ship that you hit and it's depth.
3. I've noticed that when the triangle is green, the torpedo normally hits almost at where I was aiming (not where the green triangle is located). The closer you are the better. Also, this is assuming that you opened the Torpedo tube and that the ship did not speed up.
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