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.•SO/CMS 25862

AnnexG

(norma tive)

Adjustment of magnetic compass deviation

G.1 General

A praperty adjusted compass shall havę a residual deviation within [3°] in the vessefe [82,5m| or morę, (4*| in the vessefs less than [82,5 m], and the accuractes shall be within 2°,for safe navigation.

G.2 When to adjust compass

Magnetic compasses should be adjusted when:

a)    they are first installed:

b)    they become unreliable;

c)    repairs or structural alterations have been madę to the ship that coułd affect its permanent and /or induced magnetism;

d)    ełectrical or magnetic equipment cłose to the compass is added, removed or altered;

e)    the recorded deviations are excessive or when the compass shows physical defects; or 1) at any other time deemed necessary by the master for the safety of navigation.

AJ1 magnetic compasses shaH be swung and adjusted no less often than every two years, after dry doddng or significant structural work.

G.3 Compass adjusters

The adjustment shall be carried out by a qualified compass adjuster or the ship’s master.

G.4 Adjustment by Flinders’ bars

Such adjustment shall in dudę adjustment for ałl magnetic latitudes in which the ship may operate, so that the residual deviation after any change of latitude following the ship’s second periodic swing after new construction does not exceed [5°].

G.5 Means to correct the heading to a true heading

Means to correct the heading to a true heading shall be available at all times.

For example, this means may be the residual deviation table or curve and magnetic variation information

SO

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