The four bearings method

irish1958 · 06-06-10, 07:49 PM

Quote:

Originally Posted by Kuikueg

Oops! You're right. Inconsistent notation. Thanks, I'll try and fix it.

I guess you should pay attention in English also.

Nausicaa · 06-07-10, 07:57 AM

I have read it. Very cool solution, thank you a lot for the effort !

Sailor Steve · 06-07-10, 11:10 AM

Very nice!

irish1958 · 06-07-10, 04:10 PM

Kuikueg,
Excellent paper

Thanks for your effort. And welcome aboard to Subsim. I hope you enjoy this group of people.

"Keep up the good work."

ETsd4 · 09-22-11, 11:15 PM

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 · 10-25-11, 05:51 PM

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

ETsd4 · 10-25-11, 10:09 PM

Quote:

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 · 02-10-13, 09:54 AM

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.

06-07-10, 11:10 AM	#3
Sailor Steve Eternal Patrol Join Date: Nov 2002 Location: High in the mountains of Utah Posts: 50,369 Downloads: 745 Uploads: 249	Very nice! __________________ “Never do anything you can't take back.” —Rocky Russo

06-07-10, 04:10 PM	#4
irish1958 Ocean Warrior Join Date: Apr 2005 Location: Carmel, Indiana Posts: 3,250 Downloads: 320 Uploads: 11	Kuikueg, Excellent paper Thanks for your effort. And welcome aboard to Subsim. I hope you enjoy this group of people. "Keep up the good work." __________________ Irish1958

09-22-11, 11:15 PM	#5
ETsd4 中国水兵 Join Date: Dec 2010 Posts: 278 Downloads: 91 Uploads: 0	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 Last edited by ETsd4; 11-24-11 at 02:10 PM.

10-25-11, 05:51 PM	#6
d3vnu11 Bosun Join Date: Feb 2011 Posts: 66 Downloads: 95 Uploads: 0	The math Anyone have the math involved for the solution wAs thinking about making a calc program to solve the problem for fun.

02-10-13, 09:54 AM	#8
Dignan Seasoned Skipper Join Date: Mar 2008 Posts: 698 Downloads: 262 Uploads: 0	4 bearings on a Convoy 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. __________________

06-07-10, 07:57 AM	#2
Nausicaa Mate Join Date: Dec 2008 Posts: 52 Downloads: 41 Uploads: 0	I have read it. Very cool solution, thank you a lot for the effort !

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