If you're going to allow yourself to be detected, at least make sure you're surfaced with all power assigned to the diesels and none to battery recharging, to get to maximum speed.
Otherwise, it's your job to go undetected, submerged, and approach the ship from the correct angle, with enough time to get there before the ship is ahead of your position. Man the hydrophone station yourself for precise target bearings and track its movement with markers on the map. Of course, run at ahead flank if necessary and keep your scope low or down altogether until you really need it.
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