Mark. Then,
fi
nd the division indicating the size of the object, the place where the size meets the distance
scale, indicates the distance to the object.
For example : You observe a light house and its measured Vertical View Angle is 60 miles
(Fig. 4).
Fig. 4
Rotate the Active Ring and place the division marked “6” in the View Scale at the Angle IndexMark.
Its height is 12m, the division marked “12” in the Size Scale lines up with the division marked “200” in the
Fixed Scale.
This tells that the lighthouse’s distance is 200m from us.
Where the size of the observed object is outside the scale just divide the size of the object by a number that
will bring your object size to within the scale and divide the View Angle by the same number.
As the values are on a
fi
xed scale ratio, the resulting value on the dial will be correct. (There is no need to
multiply out the result).
3.3 How to use the compass
The azimuth angle can be measured through the compass built into the right half of the binoculars.
It shows the azimuth of the object relative to the observer. Each graduation of the compass equals one degree.
When the object lies to the north, the compass shows 0 (degrees). And it will increase when you turn clockwise.
90
°
meansthe object is located to the east, 180
°
means south and 270
°
means west.
In order to ensure precise angle measurements, the binoculars should be kept horizontal and level when
reading the compass. The object should be in the middle of the reticle.
The graduations of the compass need to be illuminated for easy viewing when there is not suf
fi
cient daylight
to illuminate the compass dial. (Do not use the battery operated internal illuminating system when the outside
viewing condi- tions are bright enough to see the compass dial and marking clearly.)
10