Steiner Optik 7x50 Commander Binoculars - Manuel (Page 16)

hOw tO use the range retiCle:
Many STEINER marine binoculars feature a precision reticle
that helps users to determine the distance to objects. If
you know the height or length of what you are glassing it's
easy to determine the range. Two examples demonstrate
how fast and easy it functions
Example: While boating, another boat is crossing your
course. How far away is it? If you estimate the mast height
of that boat to be 50 feet and the vertical scale reads 25,
the distance results from the actual height (50) divided by
the scale height (25) multi plied by 1000: 50/25 = 2 x 1000
= 2000 feet.
Another Example: You're making a landfall on an island at
night. You see the high point of the island in the moonlight,
which reads 1200 feet on your chart. In your reticle the
height reads 20. Range: 1200/20 = 60 x 1000 making it
60,000 feet or approximately 11.4 miles away. Be
certain that the initial point of reference is lined up at sea
level to assure accurate measurement.
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formula for use of the Reticle:
Distance: actual height
scale height
x 1000
Actual Height: distance x scale height
1000