Course vs Angle on Bow

[Rebdomine99]

When using the manual TDC, I’m a little confused in regards to the course tool. The general course of the target is completely different to the ‘angle on bow’. Could someone please clear this up for me. Thanks.

[Davinci]

The way that I get it to work is as follows,....
Draw the North / South & East / West lines on the map and then draw a line to represent the convoys course.
Using the Protractor tool to get the convoys course and the AOB that I will intercept the convoy.
So, if the Convoy is on a course of 72 degrees and I have an AOB of 113 degrees starboard.
If the calculations are correct, the Targets course that I entered should not change.
Basically, to put that another way, if you enter a Targets course and then enter your AOB, make sure that you still have the exact same course which is 72 degrees in this example.
If you enter a targets course and then enter an AOB, and the targets course drastically changes, the torpedo will probably miss.

[Ruby]

HI,

You can read about it here. The AOB is also explained.
https://steamcommunity.com/sharedfiles/filedetails/?id=2161212854

Cheers Ruby

[wolf310ii]

AoB is relativ to your position.
If you are direkt east of a ship with course north the AoB is 90°
If you are north east or south east of the ship the AoB is 45° or -45°
If you are in front of the ship the AoB is 0°.

To measure the AoB, draw a long line with the ships course, draw a 2nd line from the 1st line in a 90° angel to your position and a 3rd line from your position to the ship, now measure the angle A between line 2 and 3. 90-A=AoB

[Rebdomine99]

Just to confirm, it the TDC does not require angle on bow? I’m not talking about the TDC mod that can be added, but the normal game TDC. It just asks for course and not AOB.

[Davinci]

My response above is with the default game, the [ AOB] is the [ Course ] button. The half circle button.
Not to be confused with their course that can be typed in.

[Ben Ritchie-Hook]

Originally posted by Davinci:

My response above is with the default game, the [ AOB] is the [ Course ] button. The half circle button.
Not to be confused with their course that can be typed in.

So how does one reliably calculate the AOB? I used to do it by using the protractor - before the ship to the bow, then to the uboat, that angle is enter in on the interface, then I get the wrong AOB. I'm following a convoy on a course of around 70, looking at a C3 with an AOB to me of 131 left - course apparently 7?

[Davinci]

Originally posted by Humphrey Appleby:

Originally posted by Davinci:

My response above is with the default game, the [ AOB] is the [ Course ] button. The half circle button.
Not to be confused with their course that can be typed in.

So how does one reliably calculate the AOB? I used to do it by using the protractor - before the ship to the bow, then to the uboat, that angle is enter in on the interface, then I get the wrong AOB. I'm following a convoy on a course of around 70, looking at a C3 with an AOB to me of 131 left - course apparently 7?

Correct, you still use the protractor, example below...
https://steamcommunity.com/sharedfiles/filedetails/?id=2199201230

1) I draw the North \ South - East \ West lines, and then verify with the protractor that it is 90°
2) I draw a line that represents the target course - in this example the target's course is 34°
3) I set my submarines course to cross over the targets course and using the protractor to set the ( AOB ) which is 75° Starboard .

So, lets say that the target is going ( 6 Knots ), ( Course 34° ), ( Range 2 Miles ) , ( AOB 75° )

Now, once you enter the ( AOB ) make sure that it doesn't change the course of 34°.

If it does change it by more than one degree either way, enter another ( AOB ) of plus or minus one degree.

Also, setting this ( AOB ) is dependent on where the Periscopes Cross-hair is positioned, meaning that if it is placed in the front or center, or rear of target, you will get different readings.

I will add that this process is probably not the intended design, but this is how it works, at least in my games.