Check my numbers please?

[NeonsStyle]

Hey All,

Solution for Angle on Bow

If it's on the port side and I have a bearing of
150, and it's course is 180 then

Angle on bow = Course - Bearing = 030 deg

If on Startboard side and I have a bearing of
250 and target course of 180

Angle on bow = Bearing - Course = 070 deg

Is this correct?

Just need u guys to check it, makes sense to me,
angle on bow is angle from their bridge to my U-boat.

Thanks :)

[Sailor Steve]

Angle On The Bow is a simple question of what HE can see. It is the angle he would see you at if he was looking at you. All you have to do is imagine you're him. Your heading and the bearing you see him at have nothing to do with it.

Here's a set of pictures that will help you get it right every time:
http://www.subsim.com/radioroom/downloads.php?do=file&id=3467

[mookiemookie]

Imagine you're standing on the bridge of the target ship, and you're holding a flashlight straight ahead. Then you take another flashlight and aim it at your submarine. What's the angle between the two beams?

That's your AOB.

[flag4]

Imagine you're standing on the bridge of the target ship, and you're holding a flashlight straight ahead. Then you take another flashlight and aim it at your submarine. What's the angle between the two beams?

That's your AOB.

...I like that!

[DemonicApe]

ok seeing as though i have only just found out what AOB means, i think i may be able to help with the most useful trick you will probably learn about the subject, as i haven't seen it in the forums yet.

Ok so if AOB is the enemy captin's bearing of you all you have to do is simply take a back bearing.
Now i havent done this in a long time and being in the british army, instead of DEG we use MILS. but the math is the same. so stick with me here.

If the bearing of the enemy ship is from 0-180 DEGS (starboard) then take the bearing your watch officer gives you or the bearing you take manually on the map and ADD 180 deg to the bearing.... this will give you your back bearing.

If the bearing of the enemy ship is 180-360 DEG (Port) then the opposite is applied and 180 deg is subtracted from the bearing of the enemy ship from you.

Now like i said i havnt used this for months, and it was in mils not deg. but hey the maths is all the same :)

Good hunting folks and i hope this helps

[Trevally.]

ingame tutorial for aob http://www.subsim.com/radioroom/showpost.php?p=1559511&postcount=36

[Sailor Steve]

If the bearing of the enemy ship is from 0-180 DEGS (starboard) then take the bearing your watch officer gives you or the bearing you take manually on the map and ADD 180 deg to the bearing.... this will give you your back bearing.

If the bearing of the enemy ship is 180-360 DEG (Port) then the opposite is applied and 180 deg is subtracted from the bearing of the enemy ship from you.
That's not right. If he is bearing 30 degrees from your bow then the opposite bearing would be 210. If he's heading directly toward you it would be 210. If his course is parallel it would still be 210. If he's heading directly away it would still be 210 by your example.

AOB has nothing to do with that at all. No matter what bearing you see him at, if he's heading straight toward you the AOB is 0. If he's 90 to your port then the AOB is 90 degrees to starboard, because that's where he sees you. If he's heading directly away from you then the AOB is 180.

AOB is the angle HE sees YOU at, nothing else matters.

[NeonsStyle]

Thankyou guys, that cleared that up nicely :D Was beginning
to wonder if anyone was going to tell me lol..

Thanks all :)

[DemonicApe]

Steve,

by no means am i going to disagree with you on this subject as i am still new to SH series.

so are we talking about the angle of the boat? or the angle of his boat becuase if you think,

In map reading if you have a bearing from you.... to a point (could be anywhere) you are walking to that point along the bearing but you lose track of where you are... standard procedure is to take a back bearing to get back to the point where you just came from. which says to me that that is the bearing from the point you were going to, to the point where you actually started in the first place.

Now moving this in to SH i just thought that would be logic, that WILL give you the bearing of your boat in relation to you target. now i think where the confusion has came here is i have miss understood the concept of AOB.

but my rule still stands for back bearings that was all i was trying to get across as that is what i thought AOB meant... if i have lead people to believe that my rule works when it doesnt for AOB then i am sorry.

but hey if you are orienteering anytime soon and need to do a back bearing at least you know how to do it now :) haha.

[gap]

http://www.subsim.com/radioroom/showthread.php?p=671548#post671548 :03:

http://img263.imageshack.us/img263/1489/aobdw8.jpg

[DemonicApe]

yep no worries, i get it now, my rule cant apply as the direction of the point changes with the way the enemy boat is facing. :) so essentially 0 deg of the target vessel isnt constant it is always moving.

PEOPLE FORGET WHAT I SAID.

[finchOU]

AOB is for the enemy's ship...not yours. His relative bearing to you is what you need to think of.

He sees you at a relative bearing of 330.... his angle on bow to is 30 degrees left (360-330=30). He see's you at a relative bearing of 70 degrees....his AOB is 70 degrees right.



It DOES NOT MATTER WHAT angle (relative or true bearing) you have to him. Only his angle to you. It's confusing because it is constantly changing in most situations.... The ONLY time you can use your Relative bearing to get exact AOB of the enemy is if you know his True Course. Then you can know that at certain relative bearings what his AOB would be to you based off of that true course you calculated.

using Gaps example.......... Enemy ship on true course 090.... you are true course 360T. Your relative bearing TO the enemy is 330. Because you know that you are on a perpendicular true course to the enemy ship... you know that if he passes your bow (relative bearing 000, true bearing 360 (you are headed 360T) his AOB will be 90 degrees right..... you can then subtract 360 from 330 to get 30 degrees...subtract 30 from 90... and you get an AOB of 60 degrees Right on the current relative bearing of 330........340 would be 70R, 350 80R, 000 90R. Confused yet?

[DemonicApe]

this is confusing haha. so what is the AOB used for then? what would a u boat commander back in the day have used it for and why?

[Trevally.]

this is confusing haha. so what is the AOB used for then? what would a u boat commander back in the day have used it for and why?

It is used so you can work out where a ship will be in the future (time+speed from the direction of travel of the target).
When you know this you can make sure that a torp is also going to be there:D

[Trevally.]

289

[Sailor Steve]

but hey if you are orienteering anytime soon and need to do a back bearing at least you know how to do it now :) haha.
It's cool. Your explanation is very helpful for that operation. The truth is that I know nothing but what others say. In this case AOB is strictly as I described, and can be best understood with the tutorial I linked.

On the other hand I have no idea why AOB is done that way, or why entering it into the TDC makes the torpedoes do what they do. I just read what the experts said, and believed them. :sunny:

[finchOU]

The TDC is an Angle solver.... putting in target Speed, AOB, and Distance will solve that angle the Torpedo needs (gyro angle) to turn after leaving the tube to impact the target given the current speed and direction of your uboat and assuming your optical device (periscope or UZO) is pointed at the target (since they are part of the TDC).

AOB is important because once you have the targets speed....and to a lesser extent distance....the current AOB basically solves for the course of the ship. ..and therefore can compute an intercept angle...or gyro angle. Distance only matters because the torpedo can't turn immediately once leaving tube (it has to go x distance before turning) therefore the gyro angle will be different depending on a couple of factors. One is the angle you shoot your torpedoes at....and the other is how close the target is too you.