Method of obtaining a table of deviations

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Division is angle contained between north-south line of ships magnetic compass and Earth’s magnetic pole.

Compass deviation is caused by magnetism in ship structure.

  • We know that Earth’s magnetic effect is least at the equator and increases as we proceed towards the pole so ideally ship should be at the equator.
  • Ship is then steered to every 10° interval starting from 000° to 360°
  • Corresponding magnetic course was noted for that every 10° interval.
  • We get variation from chart of that place in which we are sailing
  • DAVIATION calculated from it is tabulated . This is how we used to obtain daviation table.

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