Thanks for the info. I've tried it and the ranges are much more accurate.
Today I tried another passive only attack on a lone merchant. I recorded 3 bearings at long range (at least that's what the sonar operator said) with 12 minutes between them. I used the MOBO TMA to get the course. I laid the course across the 3 bearing lines on the SH4 chart and predicted the next two 12 minute bearings. I went to flank speed on the surface about perpendicular to the predicted bearing (it was a dark and foggy night). 12 minutes later I marked the bearing from the new position while moving. The range was about 12000 yrds. I then changed course to get into position at 60 degrees to the projected course.
When the prediction said the target should be at 8000 yards, I marked its predicted position on the course line, measured and entered the bearing, estimated range and speed, and calculated AOB, and turned on the PK. I intended to shoot when the PK indicated about 0 torpedo gyro angle at 1000 yrds. At about 5000 yrds I peeked and zoomed the chart so that it showed a large plan view of the ship. The ship was less than 50yrds from the predicted track, running parallel to it. Switching to the attack map, the white "X" was touching on the far edge of the ship (port side of ship when attacking from its starboard).
I submerged and lowered the scope, and then made the attack blind waiting until the PK indicated that the torpedo gyro would be zero. I fired a 2 fish spread, first 1.5 deg forward and second at 0 offset. Then I raised the scope to see what happened. Both hit.
I realize that the probability of this happening in WWII was essentially zero, and understand that the sonar in the game is like playing with torpedo duds off (which I do - torpedo factory fantasy) for the reasons that RR explained. But it was fun. One nice thing is that I didn't use TC very much at the long range since there was a lot to do until I got the PK set up.
I'd never have a chance of getting every thing done if the target was a fast warship task force.
Tom
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