Last bit of stuff from my side..
I found an error in my last wheel, corrected this and added some extra stuff. I must just 'dolly' it up a bit more before release
What this little 'gem' (I like to call it

) does is:-
From your target AOB observation
1) Target Range
2) Closest approach
.. added to this with a 1 degree target transversal
4) Your sub's relative speed
3) Target apparent and true speeds
This would mainly be useful for long range sightings where it makes use of the ship length, rather than mast height, as at long ranges the masts are difficult to see.
It is draggable