Knowledge of the principles of Describes the vertical force instrument and its use in correcting heeling the magnetic and error Describes methods of obtaining a table of deviations Analyses a table of deviations to obtain approximate coefficients States that anything which could affect the deviation of the compass should be stowed in its sea-going position before correcting it Explains the adjustment of the compass by the analysis and/or tentative Ability to determine and allow for methods and obtains a of residual deviations errors of the magnetic and States the order in which corrections should be made and explains why they are made in that order Describes how heeling error may produce an unsteady compass on 3 certain headings after a large change of magnetic latitude and how to deal with it Explains why a large coefficient B may appear after a large change of magnetic latitude and how to correct it Describes how sub-permanent magnetism gives rise to retentive error States that deviations may be affected by cargo of a magnetic nature, the Ability to determine and allow for use of electro-magnets for cargo handling, or repairs involving hammering 7 Hours errors of the magnetic and or welding of steelwork in the vicinity of the compass (Cont) Defines the magnetic moment of a bar magnet as the product of the pole strength and the length of the magnet States that, for a suspended magnet vibrating in a magnetic field, T2 is Determine and for proportional to 1/H, where T is the period of vibration and H is the field compass errors (ML) (Cont) strength Explains how the relative strengths of two fields may be found The Principles of Gyro-Compass
Determine and for compass errors (ML) (Cont) Knowledge of the principles of the magnetic and Ability to determine and allow for errors of the magnetic and Ability to determine and allow for errors of the magnetic and (Cont) Describes the vertical force instrument and its use in correcting heeling error Describes methods of obtaining a table of deviations Analyses a table of deviations to obtain approximate coefficients States that anything which could affect the deviation of the compass should be stowed in its sea-going position before correcting it Explains the adjustment of the compass by the analysis and/or tentative methods and obtains a of residual deviations States the order in which corrections should be made and explains why they are made in that order Describes how heeling error may produce an unsteady compass on certain headings after a large change of magnetic latitude and how to deal with it Explains why a large coefficient B may appear after a large change of magnetic latitude and how to correct it Describes how sub-permanent magnetism gives rise to retentive error States that deviations may be affected by cargo of a magnetic nature, the use of electro-magnets for cargo handling, or repairs involving hammering or welding of steelwork in the vicinity of the compass Defines the magnetic moment of a bar magnet as the product of the pole strength and the length of the magnet States that, for a suspended magnet vibrating in a magnetic field, T2 is proportional to 1/H, where T is the period of vibration and H is the field strength Explains how the relative strengths of two fields may be found The Principles of Gyro-Compass 3 7 Hours