Keeping your sonar cross-section small by facing or turning away from pursuers is not a bad idea, especially at long range. But when your enemy starts a depth charge run (screw-count hits the roof, depth-charges hit the water), speed up, change depth, and turn so that your boat appraoches the perpendicular to your persuer. This makes it hard to drop depth-charges along the length of your boat. Slow back down before all the charges go off.
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