Determining target's true course

Leoz · 08-26-17, 11:21 PM

Quote:

Originally Posted by YellowFin

It's called the 0-degree AOB method and is referenced as a SOP in the U.Kdt.Hdb, a tactical manual given to sub commanders by the Kriegsmarine. In fact they recommend it for every attack.

1. Intercept target
2. Get in front of target, keep taking bearings in regular intervalls, distance doesn't matter at this point
3. Cross in front of target. 0° AOB bearing -> true heading on map, and all the bearings now cross the true heading. If you've carefully taken bearings you will have a very exact speed estimate from the map.
4. Attack

I almost exclusively use this method, except when I surprise a target somehow I go for a "shot from the hip".

Check out my let's play where I demonstrate this method many times.

Greetings, and good hunting!

Great info Yellowfin.

I did not know that.

Learn something new every day.

derstosstrupp · 09-20-17, 12:24 PM

All,

Absolutely correct on this one, very effective method and the basis of the tutorial in my sig! From what I can gather from reading German SOPs, I think these procedures closely reflect historical doctrine. Included in my tutorial is also an historical method of determining target speed by timing bearing change also referenced in German period documents. Please check it out and let me know your thoughts!

http://www.subsim.com/radioroom/showthread.php?t=229792

Pisces · 09-25-17, 11:15 AM

If the target is still far away you could also use this tool with periscope bearings recorded (and the differences between them calculated) to determine what the AOB was at the 1st bearing. Then calculate back that many degrees to the bearing where AOB would appear to be 0. Then 180 degrees from that would be the bearing indicating the target (relative) course. By adding your own course and reducing any multiples of 360 degrees you get the true course of the target.

[edit] It is important that your boat is not moving or turning while doing these bearing measurements at fixed intervals.

http://www.subsim.com/radioroom/showthread.php?t=147719

09-20-17, 12:24 PM	#2
derstosstrupp Grey Wolf Join Date: Aug 2008 Posts: 918 Downloads: 490 Uploads: 0	All, Absolutely correct on this one, very effective method and the basis of the tutorial in my sig! From what I can gather from reading German SOPs, I think these procedures closely reflect historical doctrine. Included in my tutorial is also an historical method of determining target speed by timing bearing change also referenced in German period documents. Please check it out and let me know your thoughts! http://www.subsim.com/radioroom/showthread.php?t=229792 __________________ 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; 09-20-17 at 01:02 PM.

09-25-17, 11:15 AM	#3
Pisces Silent Hunter Join Date: Dec 2004 Location: AN9771 Posts: 4,904 Downloads: 304 Uploads: 0	If the target is still far away you could also use this tool with periscope bearings recorded (and the differences between them calculated) to determine what the AOB was at the 1st bearing. Then calculate back that many degrees to the bearing where AOB would appear to be 0. Then 180 degrees from that would be the bearing indicating the target (relative) course. By adding your own course and reducing any multiples of 360 degrees you get the true course of the target. [edit] It is important that your boat is not moving or turning while doing these bearing measurements at fixed intervals. http://www.subsim.com/radioroom/showthread.php?t=147719 Last edited by Pisces; 09-25-17 at 11:28 AM.