AUTONAUTIC INSTRUMENTAL 00130 Manuel d'installation et d'utilisation - Page 4
Parcourez en ligne ou téléchargez le pdf Manuel d'installation et d'utilisation pour {nom_de_la_catégorie} AUTONAUTIC INSTRUMENTAL 00130. AUTONAUTIC INSTRUMENTAL 00130 11 pages. Magnetic compass outfit
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Positioning
IMO Resolution A382(X) Magnetic Compasses Carriage and Performance Standards
includes a section on the positioning of the magnetic compass. It is also strongly
recommended that ISO 694 ‐ Positioning of Magnetic Compasses in Ships ‐ is
complied with. If, due to the special construction of the vessel, it is necessary to
deviate from these, then the Flag State Authority should be consulted, as incorrect
positioning can affect the expected performance of the magnetic compass.
Installation
Details and notes within the installation drawings give adequate information to carry
out an installation.
Care should be taken to ensure the vertical axis of the periscope and binnacle are
parallel. If there is any doubt as to the capability of the shipyard methods to guarantee
this, then we recommend the following:‐
a) Fit the binnacle as per drawings.
b) Fit the compass in the binnacle.
c) Locate the periscope into the base of the binnacle as per drawing.
d) Hold the periscope in position and check that the compass card can be viewed
through the mirror. Adjust the position if necessary.
e) Secure the ceiling flange.
2. COMPASS ADJUSTING
The binnacle has a compensation system built‐in. The compass adjusting must be
carried out by a professional compass adjuster.
The C20 binnacle compass is simple to adjust or compensate. The compensators are
the slotted shafts in the holes on the compass; note that the slots are positioned
parallel with the bottom of the case.
With the slots in this position, the compensators are in neutral and are not affecting
the compass Reading.
Turn the compensators with a piece of brass or cooper of prroper thickness. Do not
use a screwdriver, as they are often steel and may interfere with the adjusting process.
Begin the adjusting procedure after having located N‐S and E‐W or sighting points
whose direction is reliable known or can be determined from the Coast and Geodetic
Survey of the local area.
As the compass is strictly a magnetic device, it will indicate only magnetic headings.
The compensators are used only to minimize any magnetic affect of metal parts of the
boat and cannot be expected to correct the compass for true bearings.
1. Line up the boat on the mark for the North heading and observe the compass
reading. If it is not indicating a North heading, turn one of the compensators shaft
slowly until the Reading is North.
2. Turn the boat to the East maker and correct for one‐half the error observed by
turning the other shaft.
3. Repeat the steps above, if necessary, correcting for one‐halfobserved error in each
direction.
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