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-   -   Ekelund range formula, a question. (https://www.subsim.com/radioroom/showthread.php?t=218612)

banryu79 02-25-15 11:51 AM

Ekelund range formula, a question.
 
I'm trying to use (inside a spredsheet) the double leg Ekelund range formula as detailed by Goldorack in this post: here
My questions are:
#1 - Is the variable "TrgBearing_1" the faired (by least squared method) bearing of all the bearings plotted for the fisrt leg?
#2 - Is the Bearing Rate also a faired value?

EDIT#1: Some time later...
I found this post by SeaQueen, maybe there lies the answer to my question, but I'm not clever/mathematically skilled enough to sort this out... If there is anybody reading that knows or is able to come up with the answer, please, I will be happy to know it :)

EDIT#2: Even more time later...
I found explanations about the TMA process in general and about time/bearing plot, in particular, starting from page 17, chapter 10 of the "Operations Specialist - Volume 1" Nonresident Training Course, anybody can consult it here.
The time/bearing plot contains the answers to my questions above, but in graphical terms.

Mmmm... some solutions had come to my mind:

[1] Spreadsheet + formula solution.
I'm thinking that the time/bearing plot could be easly recorded in a spreadsheet, while the graphical process of fairing bearing values and measure the bearing rate could be easly translated (for those math-inclined) in a mathematical process (a formula). Now I think I understand what SeaQueen (and probably more DW users in the past) had done.

[2] Pen, paper and Bearing Rate template solution.
I think I could use an A4 squared sheet and a pen and make myself the time/bearing plot. But then I will need to use a Bearing Rate template to measure the bearing rate... Any idea on how to build one?

[3] Custom software with a GUI (let me dream...)
The more advanced solution, would be a custom software in which to input the time/bearing values for a segment and then get the faired bearing and the bearing rate as output. Well, at this point, of course, step #2 would be to give the software the ability to record/store a set of segments (TMA legs) and to compute the Ekelund range and maybe some other stuff... I've dreamed about a LOS interactive display to formulate and test multiple hypotetical solutions concurrently...

The largest obstacle inside DW, AFAIK, is the ability to take precise time/bearing readings cause the game basically gives you:
a) bearing values rounded to the nearest integer unit;
b) timed bearing reads every 2 minutes (every even game minute, to be precise).

Fortunatley I have found a solution for issue 'a' (a not-too-cumbersome technique to precisley measure bearings to the nearest decimal) but I've notyet found a solution for issue 'b'.

FPSchazly 02-25-15 08:00 PM

I have no idea what this is, but as an engineer, my curiosity with numbers is killing me haha I must investigate this!

banryu79 02-26-15 04:33 AM

Quote:

Originally Posted by FPSchazly (Post 2291216)
I have no idea what this is, but as an engineer, my curiosity with numbers is killing me haha I must investigate this!

Just make and "advanced" search in the Dangerous Water section for the string "Ekelund" or "TMA" (select the oprion "in titles only") and prepare yourself for a ton of info.

I've found very intresting info in this way, especially when I identified several users who had real Navy experience to share and looking for threads started by them. It's time consuming, but very valuable.

EDIT: First post updated.

banryu79 02-27-15 05:39 AM

Knuckle in the water...
 
Another question for those who knows... (unreleted to the current topic).
Do you know if (and how) DW models knuckles in the water produced by sudden maneuvers?

EDIT: First post updated, again.

NavyUSA 03-18-15 08:24 AM

Quote:

Originally Posted by banryu79 (Post 2291061)
Mmmm... some solutions had come to my mind:

[1] Spreadsheet + formula solution.
I'm thinking that the time/bearing plot could be easly recorded in a spreadsheet, while the graphical process of fairing bearing values and measure the bearing rate could be easly translated (for those math-inclined) in a mathematical process (a formula). Now I think I understand what SeaQueen (and probably more DW users in the past) had done.

[2] Pen, paper and Bearing Rate template solution.
I think I could use an A4 squared sheet and a pen and make myself the time/bearing plot. But then I will need to use a Bearing Rate template to measure the bearing rate... Any idea on how to build one?

[3] Custom software with a GUI (let me dream...)
The more advanced solution, would be a custom software in which to input the time/bearing values for a segment and then get the faired bearing and the bearing rate as output. Well, at this point, of course, step #2 would be to give the software the ability to record/store a set of segments (TMA legs) and to compute the Ekelund range and maybe some other stuff... I've dreamed about a LOS interactive display to formulate and test multiple hypotetical solutions concurrently...

The most efficient solution in dangerous waters is:

i) Determine the bearings from NAVmap every 2 (1 in new RAmod) minutes.
ii) Calculate the bearing rate with a pocket calculator.
ii) Knowing how to interpret the data.

ps: double leg Ekelund range formula, requires at least 16 minutes.
It's better determine the solution in tma station.


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