4 Bearings Method - Page 2

THEBERBSTER · 01-17-20, 06:27 AM

Hi guys
You might like to take a look at this one as well.

Peter

Wolfcat · 01-17-20, 02:32 PM

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?

derstosstrupp · 01-17-20, 03:51 PM

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.

derstosstrupp · 01-17-20, 03:56 PM

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

Wolfcat · 01-19-20, 04:20 AM

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.

Tonci87 · 01-22-20, 08:35 PM

Quote:

Originally Posted by Wolfcat

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?

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.

Wolfcat · 02-05-20, 11:06 AM

@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?

01-17-20, 06:27 AM	#16
THEBERBSTER Growing Old Disgracefully Join Date: Dec 2012 Location: Dibden Purlieu - Southampton Posts: 9,605 Downloads: 1123 Uploads: 0	Hi guys You might like to take a look at this one as well. Peter __________________ LSH3-2015 <> TUTORIALS <> ALL YOU NEED TO KNOW <> ALL IN ONE PLACE SH4 <> TUTORIALS <> HOW TO DO IT <> INFORMATION <> DOWNLOAD LINKS SH5 <> TUTORIALS <> HOW TO DO IT <> INFORMATION <> DOWNLOAD LINKS Always Here To Help A Fellow 'Subber' \| Need An Answer to A Question Just Send Me A PM

01-17-20, 03:51 PM	#18
derstosstrupp Grey Wolf Join Date: Aug 2008 Posts: 883 Downloads: 489 Uploads: 0	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. __________________ Ask me anything about the Type VII or IX! One-Stop Targeting Shop: https://drive.google.com/drive/folde...WwBt-1vjW28JbO My YT Channel: https://www.youtube.com/channel/UCIJ...9FXbD3S2kgwdPQ Last edited by derstosstrupp; 01-17-20 at 03:59 PM.

01-17-20, 03:56 PM	#19
derstosstrupp Grey Wolf Join Date: Aug 2008 Posts: 883 Downloads: 489 Uploads: 0	Here’s how they dood it: https://www.subsim.com/radioroom/sho...85&postcount=2 __________________ Ask me anything about the Type VII or IX! One-Stop Targeting Shop: https://drive.google.com/drive/folde...WwBt-1vjW28JbO My YT Channel: https://www.youtube.com/channel/UCIJ...9FXbD3S2kgwdPQ

01-17-20, 02:32 PM	#17
Wolfcat Chief Join Date: Nov 2012 Posts: 325 Downloads: 27 Uploads: 0	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?

01-19-20, 04:20 AM	#20
Wolfcat Chief Join Date: Nov 2012 Posts: 325 Downloads: 27 Uploads: 0	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.

02-05-20, 11:06 AM	#22
Wolfcat Chief Join Date: Nov 2012 Posts: 325 Downloads: 27 Uploads: 0	@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?