1. Setting the declination factor
Recta compasses with declination correction are fitted with an adjusting
screw, which allows you to adjust the easterly or westerly deviation. This
screw is to be found on the reverse of the capsule. By turning this
adjusting screw, the north marks are moved by the value of the declination
in relation to the scale and the N-S grid lines on the compass capsule.
Thus corrected, the north marks show the magnetic north while the scale and
the N-S grid lines continue to display true north.
1 True north pole
2 Magnetic north pole
3 Deviation between the true and magnetic north poles =
4 Adjusting screw for declination correction
5 Screwdriver (supplied with the compass)
2. The clinometer
The clinometer enables you to measure ascents or descents. Frequently it
would be useful to know the gradient of a slope, road or mountainside. This
decisionmaking aid can be of great importance for your safety (avalanche
risk, capability of vehicles for handling slopes, etc.) and reduces the
risk. With the aid of the conversion table (from degrees to per cent) on
the reverse of the mirror, you can easily measure heights (trees, houses,
A. Lateral measurement
This application can be used to determine gradients of
slopes, which pass directly across the user’s field of view.
It should be noted that the result always represents an
- Turn the reverse of the compass to face you, push in
the mirror and block it with your finger.
- Place the compass
directly across the field of view along the incline or sight the incline
over the compass
- The angle of inclination can be read off directly at the
red mark on the red scale.
The angle of inclination can be read off
on the scale.
B. Longitudinal measurement
This application is intended for determining ascents and descents which are
in a vertical direction relative to the observer. It is also possible to
determine differences in height if the distance to the object is known.
- Open out mirror and fix in position by light downward
- Tilt the compass to one side and sight the desired
along the upper long edge.
- Read off angle of inclination in the
mirror (red mark on red scale).
The values read off can be converted to percentages with the aid of the
conversion table on the reverse of the mirror (ascents, descents,
difference of height, etc.).
1 Align the lower long edge of the compass
to the target to be sighted.
2 Read off the angle of inclination in degrees
directly on the scale.