Manual TDC sub sim video
 

Hello guys,

I'm trying to learn how to use manual TDC. I have read all kind of tutoriasl and get some idea what iANGLE ON BOW actually is. As the reference I'm using a picture posted on this forum while ago
http://img20.imageshack.us/i/aobc.jpg/

Now I'm watching a subsim video about use of manual TDC and trying to understand how AoB was calculated.

http://www.youtube.com/watch?v=t3sOA-UWk74

Tear me to pieces, but I don't understand why on the video angle on bow is 129 degrees!

1) Enemy ship moving right to left
2) Sub pointer toward the enemy ship at the angle
3) Relative bearing to the ship is 340 degrees
4) Based on my understanding AoB should (between the enemy ship course and line of sight from the sub) should be less than 90 degrees on a port side!

What am I missing?

He porked the AOB and got lucky.. pretty simple.

The aob is going to be the angle from the ship's course and line of sight TO the sub. I hope I worded that correctly... since I can't draw it.

Note, I didn't watch that vid.

EDIT: I watched it. He was WAY off on that aob guess, lol. He was just so close the aob didn't matter that much.

AOB requires knowing three things:

1. Your course
2. Angle of your periscope.
3. Course of your target.

In Silent hunter V #1 wasn't as easy as looking at the compass on your interface until you go to the SH 5 Mod Workshop and download the new compass mod released today. Hoorah! GET THAT SH3 COMPASS MOD!

2. That's easy, read it off the top of your periscope view!

3. Course of your target.

Easiest way - mark the position of your target on your attack map using the drawing tools.

Mark it again anywhere between 20 seconds and 3min 15sec later.

Now draw a line between the two. Read the course of the line via the little 360* degree protractor map widget


NOW HOW DO YOU TAKE ALL THIS AND GET AN AOB??!?!!?

Angle on the pow is the all about the heading of the target relative to your periscope + ship course.

Lets say your boat is headed due North - 0 degrees

Lets say your periscope is also pointed due North - 0 degrees

Lets say your target is headed at 300 degrees.

0* is also 360*

Take your course and subtract the target's course from it.
Take 360* and subtract 300 degrees from it.

Either way you get 60.

Don't worry about the periscope because it's pointed the same direction as your bow.

The target is headed on a course 60 degrees to port of your course. The AOB is 60 degrees left (port) on your dial.


Now lets add the periscope and make this more challenging.

Lets say your boat is headed due West - 270 degrees

Lets say your periscope is pointed 90 degrees to starboard (it will read "90") - it's effectively pointed due North.

Lets say your target is headed at 300 degrees.

Now the AOB is:
Angle of periscope + difference between target's course and your course.

Course is 270, target's is 300. So 300-270= 30.

So show that the ship is headed 30 degrees to starboard of your bow on the AOB dial. BUT YOU'RE NOT DONE!!

Now add in 90 degrees for the fact that your periscope is rotated 90 degrees starboard of your bow! so your AOB is actually 30+90= 120!


Short version: AOB = your course-target's course +/- periscope angle (depending whether you're pointed port or starboard)

Jeeez, some of you guys just get too scientific when it comes to AOB.

It's very easy to just look at a ship and approximate it. And that approximation will be good enough 99% of the time.

Also, if you've been plotting range and bearings on your map.. All one has to do is measure out the AOB.

Another easy way is to turn perpindicular to the target, set 90 degree AOB while the scope is at zero, then swing the scope to the target. It's called fast 90. The scope and AOB are linked. As you move the scope it updates the AOB. So all you have to do is set it ONCE, and so long as neither of you turn... the AOB will be correct regardless of where you scope is positioned.

Yeah AoB should have been 30° not 120°. We haven't spoken to him since. The solutions given that huge AoB error happen to be very similar mathematically so he got lucky putting in the wrong number and getting the right result.

My simplistic take on what the aob is:

I'm standing at the bow of the target looking out at my course. I spot a uboat at angle x relative to straight off the bow (the uboat's course is irrelevant). Angle x is the aob.

Obviously, since you don't have an assistant standing at the bow of the target to radio you the angle, you'll need to derive it some other way. Hope this helps. :salute:

Wow TigerTank thanks a lot! This is really clear things up! Just to verify my understanding periscope on port side is "-" and on starboard side is "+"? Correct?

Thanks for the tip. This is neat addition to TigerTank formula!

Now that is relieve I have spent whole night trying to figure it out :har:

Thanks! That is how initially I thought it should be as a rough "guestimate" :up: It's nice to now that i was on the right track ! :yep:

Yes

Well, if you know the target's course, and exactly where they are on the map, it's no longer a guestimation... it IS the aob! :yeah:

(I'm assuming they gave you a protractor in sh5)

Yes you get a protractor :yep:

... but it's a crappy protractor with few precise markings. :nope: