Quote:
so in fact I *should* be changing AOB on the american subs if i slew my scope over and attack a second target, but the german sub 'does that for me' is what you're saying..
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Exactly
Here is a diagram, so you can understand how it works:
As you can see, the bearing angle is how much you have moved your scope/uzo left or right of your bow. Here it is approximately 40º to the left of our bow (i.e. bearing in your indicator would read 320).
The enemy angle on the bow is here 50.º
The tracks of both our submarine and the target are therefore crossing at 90º (180º-40º-50º=90º), giving us the track angle.
Now, provided that neither you or the target change course, the track angle will remain constant at 90º. Thus, as the target travels to the right
of the image, he will get closer to your bow. As you follow it with your periscope/uzo, he will go through 330, 340, 350 ... and hence, mathematically, his AOB will increase proportionally to 60, 70, 80 ...
This is the effect you noticed on your TDC dials, which was driving you crazy. But if you understand how it works, it can only bring advantages.
For example, as you already noted, if I shoot at multiple targets that are heading the same way *a convoy, to be more precise* I just need to move the scope and aim at each target, nothing else.
Hope that helped