Question 622Navigation General

The correct answer is C) deviation caused by the vessel's inclination from the vertical. A single vertical magnet placed underneath the compass in the binnacle compensates for deviation caused by the vessel's inclination from the vertical, which can occur as the ship pitches and rolls. This vertical magnet creates a magnetic field that counteracts the induced magnetism in the vertical soft iron due to the vessel's motion, helping to maintain the compass' accuracy. The other answer choices are incorrect because they do not accurately describe the purpose of the single vertical magnet. The magnet does not compensate for induced magnetism in the horizontal soft iron (A), the horizontal component of the permanent magnetism (B), or induced magnetism in the vertical soft iron (D).