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BigWalleye · 12-06-13, 07:51 AM

For a search pattern, I prefer what is called a “retiring zigzag” - moving along the expected line of advance with legs about equal to the visible range and legs about 60 degrees to the line of advance. This gives a search corridor about 2x the visible range and uses the sub’s motion to extend the searched area.

Hydrophone searches are useful at any time of the war, and I suspect a sharp Kaleun would use them regardless of doctrine. According to available data (http://www.uboataces.com/hydrophones.shtml), German early-war hydrophones had a range of about 20 km – for a single ship contact. That’s as good as the best modded horizon of 20 km, and almost 3x the range of the stock SH3 horizon, and the horizon is only the visibility range under optimum weather conditions.. A hydro dive every several hours should be good to catch most merchants. Once contact is made and the enemy line of advance determined, close to engage on the surface.

12-06-13, 07:51 AM	#10
BigWalleye Sea Lord Join Date: Jul 2012 Location: On the Eye-lond, mon! Posts: 1,987 Downloads: 465 Uploads: 0	For a search pattern, I prefer what is called a “retiring zigzag” - moving along the expected line of advance with legs about equal to the visible range and legs about 60 degrees to the line of advance. This gives a search corridor about 2x the visible range and uses the sub’s motion to extend the searched area. Hydrophone searches are useful at any time of the war, and I suspect a sharp Kaleun would use them regardless of doctrine. According to available data (http://www.uboataces.com/hydrophones.shtml), German early-war hydrophones had a range of about 20 km – for a single ship contact. That’s as good as the best modded horizon of 20 km, and almost 3x the range of the stock SH3 horizon, and the horizon is only the visibility range under optimum weather conditions.. A hydro dive every several hours should be good to catch most merchants. Once contact is made and the enemy line of advance determined, close to engage on the surface.