The four bearings method

[stoianm]

Originally Posted by Kuikueg

First, let me direct you to here where you will find a much improved account of the method.

Secondly: it's not a matter of preference of method. It's about the situation. In a dark, moonless night with rough weather, when sonar is the only detection tool available, the four bearings method is your only chance of chasing a target and finding a firing solution, provided that you are playing full real.

totally agree - thank for this method - excelent
btw i saw a movie with 4 bearing methode called hydro hunt (it is you that made that movie?)

[Kuikueg]

Originally Posted by stoianm

totally agree - thank for this method - excelent
btw i saw a movie with 4 bearing methode called hydro hunt (it is you that made that movie?)

No, that was makman94. It uses the old version of the method.

[stoianm]

Originally Posted by Kuikueg

No, that was makman94. It uses the old version of the method.

- i saw the new version (you refering at the situation to aplie the 4 bearing when sub is in movement i gues) but i use the old one - i am to lazy to do the hole drawing part and i use hydro traker - anyway awsome job

[Kuikueg]

Originally Posted by stoianm

- i saw the new version (you refering at the situation to aplie the 4 bearing when sub is in movement i gues) but i use the old one - i am to lazy to do the hole drawing part and i use hydro traker - anyway awsome job

Thanks.

No, both versions treat the problem of the moving submarine. The new version greatly simplifies the drawing involved and eliminates the need of a fifth bearing (which wasn't really necessary, but convenient). If you are taking the video as a guide, do no more, because although it works, it's more messy than the new. Even the fixed position situation has some new info. It's a great video, though.

[stoianm]

Originally Posted by Kuikueg

Thanks.

No, both versions treat the problem of the moving submarine. The new version greatly simplifies the drawing involved and eliminates the need of a fifth bearing (which wasn't really necessary, but convenient). If you are taking the video as a guide, do no more, because although it works, it's more messy than the new. Even the fixed position situation has some new info. It's a great video, though.

thanks... i wil take a closer look at the new version then

[kalijav]

Nice guide, however, I find it a bit confusing, I am not a geometry pro (at all), and honestly I am having a hard time understanding how it works.

I have made a little video on how I currently think I should draw the whole thing.



Can someone please tell me if I'm doing it wrong ?

Please accept my apologies for the quality of the video.

[Kuikueg]

Originally Posted by kalijav

Nice guide, however, I find it a bit confusing, I am not a geometry pro (at all), and honestly I am having a hard time understanding how it works.

I have made a little video on how I currently think I should draw the whole thing.



Can someone please tell me if I'm doing it wrong ?

Please accept my apologies for the quality of the video.

You are doing it perfectly.

[kalijav]

Yaay

I've spent so many hours on this, I'm going to try that in game now

Thanks !

[kalijav]

Since I basically had all the steps to use the method, I made a little animation showing the method "in action" (out of game) so that everybody can benefit from it.

This is a step by step tutorial, there is no explanation of the method, it is strongly recommended to read the orginal method

http://www.megaupload.com/?d=C5PU0P9E

Please give me your feedback I could also make a pdf with one page for each step, or make in in .swf.

[irish1958]

Originally Posted by kalijav

Since I basically had all the steps to use the method, I made a little animation showing the method "in action" (out of game) so that everybody can benefit from it.

This is a step by step tutorial, there is no explanation of the method, it is strongly recommended to read the orginal method

http://www.megaupload.com/?d=C5PU0P9E

Please give me your feedback I could also make a pdf with one page for each step, or make in in .swf.

A pdf would be great, especially if each step were on separate pages. On any complicated subject, having a few different slants on a subject will help in understanding.

[ETsd4]

Question was: in medium fog at which location is a warship at 06:07hour?

All the same input-data, but with 3 different results:


(1)U-52-Hydrophone guy:
distance: 3km - 25km at 280° relative bearing
course: unknown
speed: 7kn - 14 kn

(2)U-52-Navigator with u-boat-map-tools:
distance unknown at 280° relative bearing
course: 087°T
speed: unknown

(1)+(2)



(3)GeoGebra:
distance: 41 km at 280° relative bearing
course: 114° T
speed: 13.0 kn




And the worst thing is: all 3 results are wrong or not precise enough.


- Problem bearingcalls by hydrophone-guy Vs. true bearing:
http://www.subsim.com/radioroom/show...6&postcount=13

[d3vnu11]

Anyone have the math involved for the solution wAs thinking about making a calc program to solve the problem for fun.

[ETsd4]

Originally Posted by d3vnu11

Anyone have the math involved for the solution wAs thinking about making a calc program to solve the problem for fun.

Hydrophone tracker (HydrophoneTracker.zip):

[Dignan]

I hope its ok to be posting in such an old thread but I have a question regarding using the hydro to plot a convoy's course. If visibility conditions are no good (i.e. fog or night) and you are playing "no map contacts" how do you plot a convoy's course and speed?

I have become proficient at the 4 bearings method on full realism for single contacts. What I'm having a tough time with is using this method to track and plot a convoy course, speed, range. There are too many sound contacts to be able to take a bearing off a single target for all four bearings. It gets confusing and teh hydro guy starts picking up new targets and as escorts are doing their search patterns the "closest sound contact" is constantly changing making the use of the "4 bearings method" almost impossible.

What are other people's strategies for plotting a course of a convoy using the hydro (no map contacts)? Thanks.

[palatum]

Given you are quite a distance from the convoy, you should have dound bearings covering about 10 degrees. I usually try to listen where the sound is loudest, and make the plot from that bearing. Or I take the middle of the sector, ie if I hear contacts from 220-235, I take 227. Not the most accurate, but it works until I have the convoy in sight, and I can verify my results.

Palatum