4.2.6. How to measure a object’s size (height and width) using
According to the formula for distance measurement, you can calculate the height using:
H = L × ω.
When measuring the size, you first estimate the distance to the object, then measure the View
Angle. With these measurements, you can calculate the height of the target using the formula.
For example:
the distance is 0.6km between the observer and the object. You can measure that the Horizontal
View Angle is 6 decade mils(60mils) and the Vertical View Angle is 3 decade(30mils). So, using the
formula you can get:
The height: H = 0.6 × 30 = 18m
The width: h=0.6 × 60=36m
4.3 How to use the compass
The azimuth angle can be measured through the compass built into the right half of the body. It
shows the azimuth of the object retalive to the observer. Each graduation of the compass equals one
degree of angle. When the object lies in the north from you, the compass shows 0(degree) .And it will
increase when you turn clockwise. 90°means the object lies in the east from you, 180°means the south
and 270°means the west.
In order to insure precise angle measurements, the binoculars should be kept horizontal and level
when reading the compass. The object should lie in the middle of the reticle.
The graduations of the compass need to be illuminated for convenient viewing when there is not
sufficient daylight to illuminate the compass dial. (Do not use the battery operated internal illuminating
system when the outside viewing conditions are bright enough to see the compass dial and marking
clearly.) Press the illuminator button, the compass scale will be illuminated in red light for easy viewing.
4.4 Changing the batteries
The batteries for the compass will be exhausted if the internal lighting system has been used long
periods of time. Batteries can also become week if not used for a prolong period of time. If so, open the
battery cover and replace with fresh batteries.
Batteries are included and pre-installed in your binocular. When it becomes necessary to replace
them, unscrew the battery cover with a coin or screwdriver and replace with the same type. Be sure to
install the batteries in the same direction as the originals, with the flat positive (+) side facing up towards
the cover on both batteries as shown(fig.9).Screw the battery cover back on tightly and press the
compass illuminator button to test light-a glow should be visible around the compass(you may need ton
cover the right objective lens if you are outside in bright light).
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