Automatic Compensation Of The Vdo Compass - VDO Ocean Line COMPASS Montage- Und Bedienungsanleitung

COMPENSATION

Automatic compensation of the VDO Compass

All on-board iron masses of a ship are more or less magnetic and influ-
ence the compass. This effect must be compensated in a fluid compass
as well as in a fluxgate compass.
On conventional fluid compasses this requires the services of a qualified
specialist. On the VDO Compass with its automatic deviation compensa-
tion you can easily and reliably perform this adjustment yourself. As sup-
plied the VDO Compass behaves like a normal, non-compensated fluid
compass.
Perform the automatic compensation during a circular course with calm
sea, at a sufficient distance to port installations and magnetic disturban-
ces (such as steel bridges, sheet piling, other ships). The diameter of the
circle should be five or six times the ship length, the speed adapted to
complete one circle in about 3 minutes.
No valid course is indicated by the instrument during the compensation.
Perform the compensation as follows:
Start the circular course and switch the power supply on while keeping
the button pushed.
The display indicates „OFFSET“.
OFFSET
Relase the button when „OFFSET“ is displayed. After some seconds the
local compass deviation is indicated (setting see page 32).
OS 000
After another 5 seconds the display automatically changes to „CAL“.
Push the button during „CAL“ until „CAL1“ is displayed.
The pointer moves to the „CAL“ position.
CAL
Push the button
CAL 1
(Note: you have about 5 seconds to start the “CAL” function, as this fun-
ction is automatically exited after this time.)
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