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17
ENGLISH
RANGEFINDING BY MEANS OF THE COMPASS
General Information
Operation of the compass
An analog compass is integrated in the Noblex 7x50 C, which indicates the
respective direction observation, in degrees. North corresponds to 360°,
East 90°, South 180° and West corresponds to 270°. With the help of the in-
tegrated graticule, distances and object dimensions can be determined. The
graduation lines, which range horizontally from -4 to +4 and vertically from
0 to +8, each have a distance of 1 mil. Converted to a distance of 1000 m, the
lines spacing is 1 m and thus enables a simple conversion in mind.
Switch on/off of the compass lighting
The compass of the binoculars is equipped with a lighting button. When the
button (10) is held pressed, the compass display is backlit in red. When the
button is released, the light goes off again.
Daylight inlet
The daylight inlet (11) is used to illuminate the compass during the day; it is
not compelling to switch on the compass lighting. The light passage must
not be covered with your fingers, otherwise the display is not readable.
Measurements
Determination of position by means of the compass
By means of the compass binoculars, the current position can be simply
determined with the aid of a topographic map. For a precise determination,
a total of two reference values are required here.
Example:
One person is traveling by boat, but the current position of the boat is
unknown to the boatman and should be determined. In the figure a) below,
the drawn arrow illustrates the direction of travel of the boat. The following
reference values can be used to determine the position:
Reference value 1:
If the user looks on board at the targeted buoy with his
compass binoculars, he will see that 190° is displayed. Thus, the difference
between the South (180°) and the targeted buoy is 10°.
Reference value 2:
The lighthouse drawn and targeted with the help of the
compass binoculars, in figure b) is located at 120° from the boat (300°-
180°=120°).
Result:
The exact position of the boat can now be determined by superim-
posing the two determined course lines to the reference points. The current
position is where the two lines intersect.