Real navigation - Perfectly controlled approach

[Xall]

Palmic,
Thank you for your post, I been reading this and trying to figure it out.

Can you healp me with my situation?

So my case is the following:

I got a contact report, that a convoy is heading SW, so true course 225.
I made visual contact while on course 210,
and using the Raofb I estimated the distance to the target to be around 11,000 meters (11Km.)
The targets bearing is 274.

Using your formula:

Step 1.
225 (Targets Course) - 210 (Our Course) = 15 [Angle A]

And here is where I am getting issues:

Step 2.
----------- Our course 210 - target bearing 274 = -64 [Angle B] -----------

If i continue your method with this negative -64 I get:

Step 3.
180 - 15 [Angle A] - 64 [Angle B] = 101 [Angle C]

But this is incorrect since it does not check out.
Using the Attack Disk to determine the True course of the Convoy,
I entered the AOB we plotted, and the course does Not check out to 225

I get Course 203 instead.

Setting the Attack disk to the true course of the target (225) I get an AOB of 79.

So in Step 3 I should get an AOB of 79, but I believe I am doing something wrong in Step 2.


If I do 210 (Our Course) PLUS 360 MINUS 274 (Target Bearing)
I get = 296

If I do Step 3 then:
180 - 15 - 296 = -131

Something is off and I need help with it.

Hopefully you know where I am going wrong



Edit:
Is it possible that in step 2. I need to have my course (210) then add 360, and then subtract the targets bearing (274) = 296 and convert this into degrees by doing 360 - 296 ?= 64
Because then it makes sense, 180 - 15 - 64= 101.

I just don't understand why the attack disc does not add up to course 255 if i use 101 as the aob... Maybe I am doing something wrong on the attack disc, but can anyone confirm that I am doing step 2 correcty?
Basically I am getting lost when my course is a smaller value when subtracking a larger bearing value, what do I do then? Add 360 before subtraction like in step 1 (Angle A)?

Please reply...