I place myself in front of convoy and dive to PD for sound contact. I appoach at 2 knots with depth set at 14 meters. At night , I track ship with periscope. In daytime by hydrophone. Once past lead escort, I turn perpendicular to convoy path.
The idea is to shoot forward and rear tubes (seldom have the time to do that.).Depending on convoy size, position of ships and escorts, I like to let the first line go by. Then I should have plenty of targets for all my tubes. I shoot magnetics to tw ships, which haven't reached my firing line and impacts at those in front of me.
Imediately after firing I go to flank and begin the Wiggle-Waggle.
