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How to Measure the Angular
Elevation by the Vertical Scale Value
on the MIL Reticle
In the case of the Angular Elevation* of the
target object within the range of the vertical
scale value (50 mils), as in the figure showed,
firstly put the vertical scale Value ‚0' at the
foot of the lighthouse, then we could find
the Angular Elevation of the lighthouse at 40
MILs easily and directly
In the case of the Angular Elevation of the
target object beyond the range of the Vertical
Scale Value (50 Mils), we should determine
it in stages
*Angular measurement between two lines,
when one of them is surface line and another
is the line which connect a point on the sur-
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face to the peak of the object is know as An-
gular Elevation of that object with reference
to the particular on the surface
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How to Measure the azimuth
by the horizontal scale value
on the MIL Reticle
The azimuth is the angle of horizontal devia-
tion from the north As in the figure showed,
the azimuth of the ship at 60 MILs is deter-
mined by the horizontal scale value easily and
directly same way as the angular elevation
measurement
How to Measure Height or Length of
a target object when the distance is
known
Based on the way of Angular Elevation meas-
urement or azimuth measurement, we can
determine the height or length of the target
object by a simple formula as following:
Height (m) =
Distance (km) x Angular Elevation
respectively
Length (m) =
Distance (km) x Azimuth
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