AOB Calculations

[chrisp]

Been foolin, around with manual targeting in 1.3 and noticed that when I got the speed estimate, I also get a course estimate.

So fooled around more and came up with what I think is a quick way to calculate AOB:

Get the absolute bearing heading:

Sub Course + Bearing

If value greater then 360, subtract 360.

Get te absolute value of the Bearing heading - Target heading.

If the number is greater than 180, subtract 180.

Now, you might have to figure out whether the result or its complement is that actual AOB (not hard to do). I've done a lot of fiddling with protractors and it appears to work and it's really quick.

Example 1:

You're heading 30 degrees and pick up a target bearing 310 degrees. Target course appears to be 80 degrees true.

(30 + 310) = 340

|340 - 80| = 260
subtract 180 --> 80

The AOB will be either 80 or 120 (180 - 80). Since we are ahead of the target, it's 80.

Example 2:

Sub course = 60, target bearing = 319, target course = 100

(60 + 319) = 379
subtract 360 for 19

|19 - 100| = 81

AOB is either 81 or 99. We're behind the target -- it's 99.

Quick, simple, and appears to work. Can be done really easily with a calculator.

I think.

[WernerSobe]

All right but thats old :-)

you can find the AoB much easier when you know the course. No calculatioins required.

You have noticed the true course compas in your TDC device right? The upper dial represents targets true course. Just turn the AoB finder until the ship sign in the TDC compas is heading whatever the known course is.

Example: You have a target passing from right to left and you know the course is 240. First set up AoB to port, somewhere, it doesnt need to be exact yet. Then look at the upper tdc dial. The ship sign is heading to 22 (x10 = 220). That means you must correct it by 20°. Adjust it until the ship sign is heading 24.

No calculation and no ploting needed.

[chrisp]

Hmm, I knew there was a reason you made it look so easy in your excellent video tutorial!

Incidentally, thanks again for that. Changed the way I play the game!

[sqk7744]

Been foolin, around with manual targeting in 1.3 and noticed that when I got the speed estimate, I also get a course estimate.

Hope this is a good visual:
http://www.subsim.com/radioroom/showpost.php?p=579018&postcount=115

Cheers!
:arrgh!: