Calculate range to target with OneAlex?
 

I always get the range to target by using RAOBF wheel. This works perfect for me.
Now I tried to calculate range by using mast height and vertical marks in attack periscope.

I know, the target is 2300m away.

Ship has a mast hight of 31m and optical heigth at x6 zoom level is 3.2 marks.

My first problem is, what shows the vertical and the horizontal scale?
Vertical mrad or degrees? Horizontal degrees?

..for x6 zoom level (assuming vertical is mrad)
"range to target" = ("mast height" *1000 / "optical height") * 4
"range to target" = (31000/3,2) * 4
"range to target" = 9688 * 4
"range to target" = 38750m
formula did not work here.. something is wrong

..for x6 zoom level (assuming vertical is degrees)
"range to target" = ("mast height" *1000 / "optical height" * Pi/180) * 4
"range to target" = (31000/3,2 * 3,14 / 180) * 4
"range to target" = (31000/0,0558) * 4
"range to target" = 555 * 4
"range to target" = 2222m
..this could be the correct

next try
"range to target" = "mast height" / sin(alpha) * 4
"range to target" = 31/sin(3.2) * 4
"range to target" = 31/0,0558 * 4
"range to target" = 2222m
..this could be the correct

So, I think vertical shows degrees and horizontal degrees. Is this correct?

Please if above is totally wrong, feel free to correct me.