against the ruler. Turn the direction ring until the
direction slit marks point to the magnetic North
on the map. When proceeding from map to ter-
rain, all you have to do is keep the North needle
between the slit marks while going from point of
departure to destination.
- Setting a given bearing or direction
The scale division is 360 degrees going coun-
terclockwise (clockwise in SK-7) from 0
degrees at North. Turn the direction ring until
the index mark, or on the SK-7 compass the
front end of the direction line, is at the desired
direction. Turn the compass until the needle
falls between the slit marks. The direction line
now points in the desired direction.
- Magnetic declination
Maps are drawn in correlation to the geographic
poles, while the magnetic compass needle is
subject to magnetic declination, which varies
according to the location. For absolutely exact
map work, local declination (which is usually
given on the map) should be taken into
account.
- General orientation on the diving site
Before diving, check the main compass bear-
4