Determining the compass deviation by comparing of courses: The procedures for determining the compass deviation described up to here were based on the comparison of bearings.
Category: Basic Knowledge
Determining the compass deviation using reciprocal bearings: The compass deviation can be determined by reciprocal bearings, if ashore does not exist leading lines and nor faraway objects.
Determining the compass deviation using a faraway object: To determine compass deviation, we can use a single object, enough faraway, where we observe the compass bearings in the 8 (eight) courses.
Determining the compass deviation with leading lines: If is known a good leading lines with the true bearing precisely known, and magnetic variation (declination) from nautical chart, is easy to found the compass deviation.
Leading line. Leading line sensibility. The leading line sensibility: Is the property due to which, after the ship passed through the leading line (perpendicular), the 2 landmarks that make it up are staggered between them as soon as possible.
Determining compass deviation. Determining compass deviation is necessary to be done periodically, at certain time and in certain situations and drawing the diagram of Deviation curve.
Gyro-compass Speed Error. Gyro-Compass Speed Error: an error of the gyro-compass; the gyroscope axis deviation from to the true north direction.
Magnetic Compass Deviation. This article is similar to the previous post, but refer to compass bearings. The Magnetic Compass Deviation is the angular deviation of a compass card, to right or left of the magnetic meridian, determined by the influence of magnetism of the ship or cargo;
Magnetic Compass Deviation. The Magnetic Compass Deviation is the angular deviation of a compass card, to right or left of the magnetic meridian, determined by the influence of magnetism of the ship or cargo;
Magnetic Variation or Declination. Magnetic Variation or Declination is the horizontal angle formed between the geographic meridian and magnetic meridian.