Wrong name, but a workable system.
90 degree shot means, the TORPEDO makes a 90 degree turn.
What you are referring to is a simple bow shot, with a 90 degree AOB.
(It's still a bow shot.)
Your system uses a very simple, old, and valid navigational rule:
Constant Bearing + Decreasing Range = Colision is imminent.
As BDU says: Keep up the good work!
Well done.
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