How to calculate Target Course

Shelton · 08-24-07, 05:19 PM

Hi all

I am playing SH3 with map updates off so in the nav window I cannot see the target. Does anyone know how to calculate the target course given the following parameters?

1. Relative Bearing to Target
2. My uboat Heading
3. Angle on the Bow (of the target to uboat)

So just say
1 = 240 degrees
2 = 90
3 = 60 starboard

What is the ships/targets heading ?

Regards
Shelton.

joegrundman · 08-24-07, 05:42 PM

EDIT--THESE MATHS ARE WRONG, SEE FURTHER DOWN FOR THE CORRECT SOLUTIONS!

OK, start with your heading. Add the periscope angle. Then add the AOB if it's starboard or subtract the AOB if it's port.

E.g.1. your heading 000, periscope angle 090, AOB starboard 90, target course =180
E.g.2 heading 055, scope angle 235, AOB port 25, target course = 055+235-25=290-25=265

In your example, 240, 90,starboard 60, target course =240+90+60=390=030

You can also draw it on the map using the protractor tool

But easiest of all is to build yourself a proper KM or US whiz wheel and solve the problem in seconds without ever having to think about it. You can also use it to plot a course that will give you the desired firing position

http://www.subsim.com/radioroom/show...ght=whiz+wheel

ichso · 08-24-07, 05:45 PM

240 + 90 + 60 modulo 360 = 30°

But someone was still faster

For long range calculations you will need a more exact course than you get from rough AoB estimations.
So better make observations of the target's position relative to your own ones and mark them on the Nav map.

Then you can just read the target's course from there. You can then plan your attack so that the AoB is a very simple one, like 90°
See Wazoo's manual plotting tutorial - Fast 90° method (for example).

The Wiz Wheel should be the most historically accurate one though. At least for german submarines from that period.

GoldenRivet · 08-24-07, 05:50 PM

i modestly submit my very first tutorial video.

this tutorial video instructs the viewer on how to plot solutions on paper using a ruler and protractor

it assumes the player already knows how to gather range to target, and understands headings and bearings

view it and PLEASE offer constructive critisism.

thanks!

http://hosted.filefront.com/GoldenRivet/

joegrundman · 08-24-07, 05:55 PM

I may have been faster, but i was certainly wrong!

Actually i don't know hot to do it. Just build a whiz wheel. It's much easier

Shelton · 08-24-07, 06:33 PM

Just watched the tutorial video - fantastic!! yes as you mention it becomes very difficult if my uboat is also moving - but i get the general idea - so there isn't a forumale i use to calculate the target course - other than plotting at different times?

XLjedi · 08-24-07, 11:20 PM

Quote:

Originally Posted by GoldenRivet

i modestly submit my very first tutorial video.
.
.
.
view it and PLEASE offer constructive critisism.

thanks!

http://hosted.filefront.com/GoldenRivet/

wow... nice video. I liked it.

You're manually drawing half of a maneuvering board. You plotted the DRM line (direction of relative motion) and since you mention being stationary you are also correct that it equates to the contact TC (true course).

If your sub was moving, you would need to plot a movement vector for your sub and the contact speed and DRM. It's not difficult, I could show you how to do that if you like.

Shelton · 08-24-07, 07:45 PM

Quote:

Originally Posted by joegrundman

OK, start with your heading. Add the periscope angle. Then add the AOB if it's starboard or subtract the AOB if it's port.

E.g.1. your heading 000, periscope angle 090, AOB starboard 90, target course =180
E.g.2 heading 055, scope angle 235, AOB port 25, target course = 055+235-25=290-25=265

In your example, 240, 90,starboard 60, target course =240+90+60=390=030

You can also draw it on the map using the protractor tool

But easiest of all is to build yourself a proper KM or US whiz wheel and solve the problem in seconds without ever having to think about it. You can also use it to plot a course that will give you the desired firing position

http://www.subsim.com/radioroom/show...ght=whiz+wheel

thanks for the tips and the link as well!

joegrundman · 08-24-07, 10:23 PM

If you can't be troubled with making your own whiz wheel (I have made three, and the US ISWAS style is my favourite), the good news is that I am working on an electronic version of the KM whiz wheel that would appear in game. It's at a beta level now, it functions but not really well enough. However I am interested in having a playtester that could give me some constructive advice for it.

XLjedi · 08-24-07, 11:23 PM

Quote:

Originally Posted by joegrundman

If you can't be troubled with making your own whiz wheel (I have made three, and the US ISWAS style is my favourite), the good news is that I am working on an electronic version of the KM whiz wheel that would appear in game. It's at a beta level now, it functions but not really well enough. However I am interested in having a playtester that could give me some constructive advice for it.

Will it be analog or digital? I was planning on inclucing an analog one in MoBo v1.1 myself... I'd be happy to take a look at whatever you've got.

joegrundman · 08-24-07, 11:49 PM

It's analog. it looks and functions more or less like the authentic one. If you PM me your email address I'll send you my WIP

joe

08-24-07, 05:19 PM	#1
Shelton Planesman Join Date: Sep 2002 Location: Brisbane, Australia Posts: 195 Downloads: 0 Uploads: 0	How to calculate Target Course Hi all I am playing SH3 with map updates off so in the nav window I cannot see the target. Does anyone know how to calculate the target course given the following parameters? 1. Relative Bearing to Target 2. My uboat Heading 3. Angle on the Bow (of the target to uboat) So just say 1 = 240 degrees 2 = 90 3 = 60 starboard What is the ships/targets heading ? Regards Shelton. __________________ I use Linux http://www.kde.org/screenshots/

08-24-07, 05:42 PM	#2
joegrundman Ocean Warrior Join Date: May 2007 Posts: 2,689 Downloads: 34 Uploads: 0	EDIT--THESE MATHS ARE WRONG, SEE FURTHER DOWN FOR THE CORRECT SOLUTIONS! OK, start with your heading. Add the periscope angle. Then add the AOB if it's starboard or subtract the AOB if it's port. E.g.1. your heading 000, periscope angle 090, AOB starboard 90, target course =180 E.g.2 heading 055, scope angle 235, AOB port 25, target course = 055+235-25=290-25=265 In your example, 240, 90,starboard 60, target course =240+90+60=390=030 You can also draw it on the map using the protractor tool But easiest of all is to build yourself a proper KM or US whiz wheel and solve the problem in seconds without ever having to think about it. You can also use it to plot a course that will give you the desired firing position http://www.subsim.com/radioroom/show...ght=whiz+wheel __________________ "Enemy submarines are to be called U-Boats. The term submarine is to be reserved for Allied under water vessels. U-Boats are those dastardly villains who sink our ships, while submarines are those gallant and noble craft which sink theirs." Winston Churchill Last edited by joegrundman; 08-24-07 at 10:16 PM.

08-24-07, 05:45 PM	#3
ichso Ace of the Deep Join Date: Jul 2005 Location: Germany's oldest city alive Posts: 1,066 Downloads: 57 Uploads: 0	240 + 90 + 60 modulo 360 = 30° But someone was still faster For long range calculations you will need a more exact course than you get from rough AoB estimations. So better make observations of the target's position relative to your own ones and mark them on the Nav map. Then you can just read the target's course from there. You can then plan your attack so that the AoB is a very simple one, like 90° See Wazoo's manual plotting tutorial - Fast 90° method (for example). The Wiz Wheel should be the most historically accurate one though. At least for german submarines from that period. __________________ My Subskins: http://www.subsim.com/radioroom/showthread.php?t=164169

08-24-07, 05:50 PM	#4
GoldenRivet Subsim Aviator Join Date: Mar 2007 Location: Texas Posts: 8,729 Downloads: 146 Uploads: 0	i modestly submit my very first tutorial video. this tutorial video instructs the viewer on how to plot solutions on paper using a ruler and protractor it assumes the player already knows how to gather range to target, and understands headings and bearings view it and PLEASE offer constructive critisism. thanks! http://hosted.filefront.com/GoldenRivet/ __________________

08-24-07, 05:55 PM	#5
joegrundman Ocean Warrior Join Date: May 2007 Posts: 2,689 Downloads: 34 Uploads: 0	I may have been faster, but i was certainly wrong! Actually i don't know hot to do it. Just build a whiz wheel. It's much easier __________________ "Enemy submarines are to be called U-Boats. The term submarine is to be reserved for Allied under water vessels. U-Boats are those dastardly villains who sink our ships, while submarines are those gallant and noble craft which sink theirs." Winston Churchill

08-24-07, 06:33 PM	#6
Shelton Planesman Join Date: Sep 2002 Location: Brisbane, Australia Posts: 195 Downloads: 0 Uploads: 0	Just watched the tutorial video - fantastic!! yes as you mention it becomes very difficult if my uboat is also moving - but i get the general idea - so there isn't a forumale i use to calculate the target course - other than plotting at different times? __________________ I use Linux http://www.kde.org/screenshots/

08-24-07, 10:23 PM	#9
joegrundman Ocean Warrior Join Date: May 2007 Posts: 2,689 Downloads: 34 Uploads: 0	If you can't be troubled with making your own whiz wheel (I have made three, and the US ISWAS style is my favourite), the good news is that I am working on an electronic version of the KM whiz wheel that would appear in game. It's at a beta level now, it functions but not really well enough. However I am interested in having a playtester that could give me some constructive advice for it. __________________ "Enemy submarines are to be called U-Boats. The term submarine is to be reserved for Allied under water vessels. U-Boats are those dastardly villains who sink our ships, while submarines are those gallant and noble craft which sink theirs." Winston Churchill

08-24-07, 11:49 PM	#11
joegrundman Ocean Warrior Join Date: May 2007 Posts: 2,689 Downloads: 34 Uploads: 0	It's analog. it looks and functions more or less like the authentic one. If you PM me your email address I'll send you my WIP joe __________________ "Enemy submarines are to be called U-Boats. The term submarine is to be reserved for Allied under water vessels. U-Boats are those dastardly villains who sink our ships, while submarines are those gallant and noble craft which sink theirs." Winston Churchill