Not exactly...
The ruler tool in the game is using NM or Nautical Miles. However the periscope is using Yards...why, well I did not write the game.
I guess NM is used more often when looking at charts and maps and stuff and yards is used in this case for a visual contact.
The "MOD" is using a "METER" overlay scaled up to use the for example the 100m as 0.1nm, 200m as 0.2nm etc etc.
I am running 1280x1024 and this is what I get.
As you can see the ruler shows 0.6nm and the 360 bearing tool shows 600
I guess you could call that 0.600 or one would have to rework the graphics.
But that was not your problem.
Now check this
01225...yards...or?...well i would say pretty spot on :p
Now watch
Not 100% but close enough for my money (considering I was not spot on measuring with the ruler.
Nothing wrong with the mod...or?
Now you had 1600 yards in the scope and saw 700 on the navi map...watch
not 100%, but close enough...
Sticking out my neck here :p
But why didn't the whole world go "Metric" like the rest of Europe when they had the chance..well they are doing it inch by inch.
Now that's a bad joke if i ever heard one!.