Unless a mod has changed it, for the scopes, the small marks are 1°, the large ones 4°.
So, at low magnification:
Range in yards = mast height in feet / 3 / tan (# of small marks)
At high magnification, multiply the answer by 4.
For the TBT, the small marks are 0.2°, so:
Range in yards = mast height in feet / 3 / tan (# of small marks * 0.2)
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