Another thing you have to take into consideration is the rise and fall of the ship in the waves.
Even though you set it for 1ft below the keel..when the torpedo reached the ship the ship may have been in an upward climb on the waves hence your shot will simply go right underneath and not detonate.Ive had this happen quite a few times.
I simply don't use magnetics in anything but perfectly calm waters..otherwise it is all impact fuses on my fish.
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