I see a problem :
In your example mast height is 66 Feet.
TDC Stadiometer range = 547 Yards.
Each Graticule marker is 0.25 Deg (Supposed to be that is)
Mast height = 7 Markers high.
7*0.25 Deg = 1.75 Deg.
Range = 66 Feet /Tan 1.75 Deg = 2,160 Feet. which = 720 Yards.
If you look at your game map thats how far your sub WILL be from the target .
Check it I will be interested to see what you find.
EDIT: To get a range of 1641 feet (547 Yards) out of a mast height of 66 feet
Would require a Graticule angle per marker of approx 0.33 Deg on the high range attack scope.
Or in your example 7*0.33 Deg = 2.31 Deg mast angle.
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