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CONTROL STATION
Studio ti 03312 540-04usa
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Compass compensation
Read carefully the manual delivered by the manufacturer.
Objects in the immediate vicinity influence every compass. Deviation is
the angular difference between the reading your compass provides as
installed and the reading it would provide if the objects were not there.
Deviation is expressed in degrees East or West of true North. It varies
with the heading of your vessel because, as your vessel turns, the
position of the objects that affect the compass change relative to the
magnetic North.
You must record deviation of the compass on a compass deviation card
and place it near the compass. You must record the deviation for each
individual compass that you use, because the position of each compass
relative to the materials around it determines the deviation.
You compass is fitted with a set of compensation, or adjustment, screws
to minimize these errors. It is seldom possible to compensate for all
compass deviation errors, since this type of error varies as the heading
of your vessel varies. However, the error should remain the same for any
given heading, as long as no changes are made to instruments and
electronic fixtures near the instrument panel.
There is a vertical mark on the compass called a “lubber line”. This line
was oriented when your compass was installed, so an imaginary line
drawn from the compass pivot point to the lubber line will be parallel to
the longitudinal axis of your vessel. Thus, your vessel’s course is the
compass card reading below the lubber line.
NOTICES
Never unscrew for any reason screws and filling caps (1). The only
screws that may be turned are the adjusting screws (2) by means of the
non-magnetic screwdriver provided. When the adjuster’s screw slot (2)
is horizontal, the compensation is neutral. When the slot is vertical, the
compensation is at its maximum. This operation must be carried out
only by a trained compass adjuster.
NOTICES
At least once a month check the operation and the deviations. If
necessary, have a new compensation of the compass turns carried out.
Neutral
Maximum
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