UZO range estimating to target

[NiceSub]

Originally Posted by derstosstrupp

Not sure these factors are correct. You need to multiply by the sine of the observed angle on bow, which should be a decimal place.

So 220 m target at a 90 AOB using the numbers above would be 2000 m away, if it were at 60 AOB taking up the same length in the UZO it would be closer (2000 x sin(60) = 1732).

Unless you mean divide, in which case:
AOB 60 —-> 1.15
AOB 45 —-> 1.41
AOB 30 —> 2

Right so based on your knowledge how can I use UZO to estimate range by counting tickmarks or something else?