Hi guys
You might like to take a look at this one as well.
Using the four bearings method while moving. Silent Hunter

Peter

just wonder how realistic the 4-bearing method is in real life? I mean it's impossible to maintain stationary or on a straight course when undersea current can blow your sub off course. Do submariners in WWII actually use this method?

Its real name is Spiess TMA and it was developed in the ‘50s. German doctrine wouldn’t have even permitted it had it existed and if hydrophone bearings were accurate - they stressed that the place for the boat was on the surface.

Here’s how they dood it:
https://www.subsim.com/radioroom/sho...85&postcount=2

While I was doing the 4 bearing tutorial. At the last moment, the sonar man lost contact even though I can hear it loud and clear on hydrophone. The sonar man just refuses to pick it up. Is this a bug or something I am missing here.

That is why in my video I used a version of the 4 bearings method where the sub is on the move.

Is this method historic? Hard to say really.
As derstosstrupp said a submarines place was, if possible, on the surface, and surfaced attacks at night where the preferred method of attack during the first years of the war.
However, this changed radically mid war when staying on the surface became far to dangerous, due to aircraft and radar equipped escorts.

While this particular method was developed in the 50ties, other methods to determine a targets position, by observing the change in bearing to target over time, where already in use much earlier than that.

@Tonci,

I have noticed the bearing read on the scratchpad next to the hydrophone is always 1 degree higher than what sonarman orally reports when you tell him to follow the target. So which bearing number do you go with? Right now, I don't know which one is correct so I take average of the 2 numbers. Say if scratchpad show 72 and sonarman says 71, I use 71.5 for my mapwork. Is that a good way to do this?