Important Notice
Maintenance through Remote Deviation Adjustment is deemed fraudulent.
Deviation adjustment necessitates the presence of a qualified individual on board to inspect and maintain themagnetic compass, followed by a sea trial where the ship is turned 360-degree to measure and correct the deviation
with a maintenance certificate issued thereafter. Unscrupulous operators claim that a 90-degree turn data
sufficiency, or even making stationary adjustments while ship is docked are acceptable. Such improper maintenancecannot guarantee safety. The magnetic compass is the last important heading device in an emergency.

The Japan Compass Adjusters' Association is an organization of qualified professionals.

.

Is your Marine Magnetic Compass properly adjusted ?
TheISO (Internationalto the construction

OrganizationandforStandardization)

published ISO25862

in Mayperformance of marine magnetic compass for navigation

and2009

with regard

steering purposes.

Such compasses now need more careful adjustment and check than before.

Shoud your ship's condtion be as follows then your magnetic compass will need it'sdeviation checked.
Ship's condition and pastlife history
A new ship particularly in thefirst few months and under 2years old.

Reason why theAction that should be taken

magnetic compass
may be influenced
There has been a greatchange in the ship's
magnetic field.

Your ship:
Ship's magnetism mighthas been struck by lightning.
have changed.
has vibrated violentlly.
has been in a fire.
Large deviations in the direction B component errorof east and west only.
compensation may not
be possible for your ship.
See Note＊3
Over 2 years old.
Ship's magnetism changedby the earth magnetic field.

Measure the deviation frequently.
Fill out the attachead table recording on it, the gyrocompass course and deviation as requested by Note＊1
below . Should you be unable to correct the deviation
yourself. Please request the assistance of a trained
compass adjuster. See Note ＊2.
Measure the deviation.
Should the deviation exceed that in the regulations.
Please request assistance. See Note ＊2.
Please conplete the attached table so that the present
performance of the magnetic compass is known. See
Note ＊1 . Should a authorized compass adjuster berequired. Please request as stated in Note ＊ 2.
The deviation should be measured and corrected every
1 or 2 years. Please request assistance. See Note ＊ 2.

Note ＊１ Measure and record the deviation in the 8 main compass courses (N.NE.E.SE.S.SW.W.NW). Note also the ship's latittude andlongitude, magnetic variation and the correctors' data. The information will be required by your compass adjuster.
＊2

Make your request for a compass adjuster through the Japan Compass Adjusters' Assocuation (JCAA) or via your agent orshipyard.

＊3 Flinders bars and fore-and-aft side correcting magnets are required to reduce the deviation. Note that the coefficient B.
will only be minimized if the adjusting has done on the magnetic equator or two positions. If the adjusting has done in
only one position it might not be possible to obtain a completely accurate adjusting.

A magnetic conpass is not suitable for PSC(Port State Control) requirement (＊４) in the following

condition. It should be checked repaired and overhauled as necessary.
Note ＊4 The following problems have been noted by PSC in the past 5 years.

・It has been not possible to read the information on a magnetic compass due to a broken light bulb.
・In some cases the deviation has not been read in all courses specifically asked for.
・The compass bowl dones not maintion the horizontal level.
・There are some bubbles in the compass bowl.
We send this brochure to ship's captains, owners and management companies.
The Japan Compass Adjusters' Association and our compass adjusters are ready to help with the correct andappropriate adjustment of your magnetic compasses. This will lead safer navigation.
Establish your navigation safety with a deviation-corrected magnetic compass together JCAA.

JapanCommpass
mail@jcaa.jp

Adjusters'Association
Fax : +813-6734-0713

Please complete that table when you find your magnetic compass errors exceed the correct figures and you require
the help of a compass adjuster.
This table should be sent via a shipyard company or your agent.

Your namephone number
e-mail address
Please write in block capital letters.
Ship' sname(Gross Tonnage)
Date of last adjustment
month/day/year

Present condition/（Name of adjuster
Registered number/

Manufacturer & Type Manu.

G/T）

TypePosition at which following measurements were taken. Lat.

Long.

Date of the following measurements.

/Cargoinformation

month/day/year

Contents

Load condition(kind)of ship/
Full ・Half・ Empty

Compass

NNEESESSWW

NW

course

0°

45°

90°

135°

180°

225°

270°

315°

⇦⇦

⇦

⇦

⇦

⇦

⇦

Variation
Gyro compass
courseDeviation
Type,number,length,and position of adjustment bars & magnets
Flinders bars(number,length)

numberExample : 3 pieces, 15cm

lengthfor adjustment

Fore & Aft. Magnets

Port (number,insertion position scale(force)*1)
ex)3: 15(S),13(M),12(W)Draw a circle to the right to indicate the position of the red end.

magnet red end : Fore / Aft

Starb'd (number,insertion position scale(force)*1)
ex)3: 15(S),13(M),12(W)Draw a circle to the right to indicate the position of the red end.

magnet red end : Fore / Aft

Position:

Athwartship magnet for adjustment(number,scale*1)ex)2: 12(S),10(W)Position：

Draw a circle to the right to indicate the position of the red end.
*1

S：Strong(dark blue/red)

M：Medium（blue/red）magnet red end : Port / Starboard

W：Weak(light blue/red)(The shade of indicates the strengh of the magnet'smagnetic field.)
The content of the work record of the last deviation correction is very effective informetion for new work.
Please send the last deviation adjusting record to JCAA if it is possible. We wish express our gratitude.

＊＊＊＊＊＊

Please copy this sheet before use.

There is same table at our web site.

JapanCommpass＊＊＊＊＊＊

http://www.jcaa.jp/table-e.html/

Adjusters'

AssociationSend to : mail@jcaa.jp Fax : +813-6734-0713 or Send to the Last Adjuster