Unit of competency Outline

Date retreived
22/07/2026 12:44 PM AWST

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Apply knowledge of the principles of magnetic compass adjusting

Apply knowledge of the principles of magnetic compass adjusting

Unit of competency
National Code
MARB052
State Code
OCY30
TGA Status
Current
DTWD Status
Approved
Current Release Number
2.00
Current Release Date
22/11/2024
View on TGA
State Implementation and Classification
Approved Date
19/05/2021
Field of Education
031705 - Marine Craft Operation
Original Release Date
19/05/2021
Nominal Hours
45
Description
Notes
Elements and Performance Criteria
1 Explain principles ofmagnets, magnetism and magnetic fields
  • 1.1 Laws of magnetism are explained
  • 1.2 Properties of magnets are described
  • 1.3 Principles of magnetic fields, magnetism and magnets are explained
  • 1.4 Effects of magnets on a magnetic compass needle under varying conditions are described
  • 1.5 Disturbing and restoring forces and position of equilibrium is explained
  • 1.6 Molecular theory of magnetism is explained
  • 1.7 Magnetic effects of electrical currents are described
2 Explain terrestrial magnetism
  • 2.1 Principles of terrestrial magnetism are described
  • 2.2 Magnetic variation is defined, and explanation given as to why it varies depending on location on the earth, time of day and effects of the sun and moon
  • 2.3 Method to determine magnetic variation at a location is described
  • 2.4 Angle of magnetic dip is described
  • 2.5 The earth's total force (T), horizontal force (H) and vertical force (Z) are explained
  • 2.6 Local magnetic anomaly is described
  • 2.7 Terrestrial magnetism and varying strengths in different parts of the world and the effects on deviation are explained
3 Explain ship’s magnetism
  • 3.1 Effects of the ship's permanent and induced magnetism is described
  • 3.2 Forces P, Q and R with the ship upright are described
  • 3.3 Induced magnetism in soft iron rods a, b, c, d, e, f, g, h and k are described
  • 3.4 Temporary permanent magnetism and its effects at sea are outlined
  • 3.5 Causes and effects of Gaussin error are described
  • 3.6 Effects of permanent and induced magnetism on directive force are explained
  • 3.7 Lambda (λ) and mu (μ) are explained
4 Explain principles ofmagnetic compass design and construction
  • 4.1 Size and relative position of magnetic compass needles are identified
  • 4.2 Location of soft iron correctors and permanent magnets with reference to each other and the compass needles are identified and the effect that each corrector has on the other correctors are described
  • 4.3 Relative position of lubber mark/line, card, pivot and gimbals axes are identified
  • 4.4 Types of correctors used in ships are described and their advantages and disadvantages are outlined
  • 4.5 Effects of placing compasses in close proximity to magnetic material, electrical devices and other disturbing influences are described
  • 4.6 Components of a magnetic compass are identified
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