Compass course with deviation applied; magnetic course |

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Compass course with deviation applied; magnetic course |

## Related Terms |

## MAGNETIC COURSECourse relative to magnetic north; compass course corrected for deviation. magnetic daily variation. |

## RETENTIVE ERRORDeviation of a magnetic compass due to the tendency of a vessel’s structure to retain some of the induced magnetic effects for short periods of time. For example, a vessel on a northerly course for several days, especially if pounding in heavy seas, will tend to retain some fore-and-aft magnetism gained through induction. Although this effect is not large and generally decays within a few hours, it may cause incorrect observations or adjustments, if neglected. This error should not be confused with GAUSSIN ERROR. |

## COMPASS COURSECourse relative to compass north |

## APPROXIMATE COEFFICIENTSThe six coefficients used in the analysis of the magnetic properties of a vessel in the course of magnetic compass adjustment. The values of these coefficients are determined from deviations of an unadjusted compass. |

## GAUSSIN ERRORDeviation of a magnetic compass due to transient magnetism caused by eddy currents set up by a changing number of lines of force through soft iron as the ship changes heading. Due to these eddy currents, the induced magnetism on a given heading does not arrive at its normal value until about 2 minutes after change to the heading. This error should not be confused with RETENTIVE ERROR. |

## FLINDERS BARA bar of soft unmagnetized iron placed vertically near a magnetic compass to counteract deviation caused by magnetic induction in vertical soft iron of the craft |

## MAGNETIC MERIDIANA line of horizontal magnetic force of the earth. A compass needle without deviation lies in the magnetic meridian. |

## C.C.T.S.Compass course to steer. |

## CORRECTED COMPASS HEADINGCompass heading with deviation applied; magnetic heading |

## COEFFICIENT AA component of magnetic compass deviation of constant value with compass heading resulting from mistakes in calculations, compass and pelorus misalignment, and unsymmetrical arrangements of horizontal soft iron. |

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