VDO COMPASS - Setting of the Position-Dependent Variation

The automatic compensation should be repeated after com-
pass installation, after slipping, prior to long routes, after wel-
ding operations, after the installation of electrical consumers,
but at least once a year.
Please also note the „semihard magnetism“ effect on steel
ships, which appears when the ship has been exposed to the
terrestrial magnetic field without position change for a long time
(for instance during winter). After some days in the water this
effect has disappeared. This means that after watering a ship
the compass compensation should be repeated several days
later.
Setting of the position-dependent variation
This operation is necessary to set the valid local variation. The angular
variation is found in the nautical map. Setting the variation eases wor-
king with the map, and after compensation (see page 30) the compass
will indicate the true course.
Enter the variation as follows:
Switch the power on while keeping the button pushed. The pointer is in
„OFF“ position, and the display indicates „
OFFSET “.
Release the button when „
OFFSET “ appears. The local variation is indi-
cated after several seconds. In the system as supplied the indication will
be 0.
(Note: You have about 5 seconds to start the „OFFSET“ function, after
this time the function is automatically exited). For each button activation
the value is incremented by 1°. Hold the button down; the value will in-
crement at increasing speed up to 100°, then it will decrement from -100°.
Positive setting = variation in eastern direction.
Negative setting = variation in western direction.
Release the button after setting the correct value (3° in the example).
After some seconds the display automatically changes to „CAL“.
After another 5 seconds a normal course indication is shown (in the ex-
32
POSITION-DEPENDENT VARIATION
OFFSEt
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comp_e.qxd 08.04.1998 07:44 Seite 12