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What is compass deviation card?

What is compass deviation card?

a card, sheet, or the like, with two compass roses printed on it concentrically, for recording, on a given voyage, the amount of deviation for which the navigator must compensate in using the ship’s compass to steer a magnetic course.

Can a compass be calibrated?

A properly surveyed compass calibration pad, also called a compass rose, constructed to applicable FAA standards may be used to determine alignment of an aircraft compass with the Earth’s magnetic field. Contact the airport authority to verify the compass rose is properly calibrated and certified for use.

How long is a compass deviation card valid for?

two years
Finally, according to ISO 25862: 2009 “Ships and Marine Technology”: All SOLAS vessels should have their compass adjusted and at maximum every two years to issue a new deviation card. When a new vessel is commissioned, compass deviation on any heading should be no more than 3° degrees.

What is the purpose of correcting compass?

Correction of compass errors is generally achieved by applying correctors so as to reduce the deviations of the compass for all headings of the ship.

How do I calibrate my digital compass?

Calibrating a digital compass is fairly simple task.

  1. Place the compass in its calibration mode.
  2. Handheld compass: with both hands hold the unit in a level field and with your hands stretched out, slowly make two turns around yourself within 10 to 20 seconds.
  3. Auto Compass: install the compass in its final place.

https://www.youtube.com/watch?v=YX2cblelL1M

Where do you find the compass correction card?

compass correction card. Compass correction/deviation card. A small card placed in the cockpit to show the compass deviation for each heading.

Where is the compass card in the cockpit?

compass correction card. Compass correction/deviation card. A small card placed in the cockpit to show the compass deviation for each heading. The card reads the courses to be steered in lieu of the required headings.

What are the steps in a compass calibration?

Compass calibration typically involves two steps. First, compass compensators are adjusted to minimize the influence of aircraft-induced fields that generate errors; and second, a correction card is prepared to indicate remaining error.

How is compensation and preparation of a compass card performed?

Compass compensation and preparation of a compass card is performed by attaching the test apparatus to the standby compass after it has been referenced to magnetic north and adjusted to neutralize the Earth’s existing magnetic field. A knob on the apparatus allows adjustment of the simulated heading field.