Question 629Navigation General

The correct answer is B) the angular difference between magnetic north and compass north. Magnetic compass deviation refers to the difference between the direction indicated by the magnetic compass and the true (geographic) north direction. This deviation is caused by the influence of the ship's own magnetic fields on the compass needle, and it can vary depending on the ship's heading and location. The other options are incorrect: A) Magnetic compass deviation does not vary depending on the bearing used, but rather remains a constant value for a given ship and location. C) The compass rose on nautical charts shows the angular difference between true north and magnetic north, not the deviation of the ship's compass. D) The angular difference between geographic and magnetic meridians is called magnetic variation, which is different from magnetic compass deviation.