The quadrantal spheres are used to __________.

Correct Answer: Option A — remove deviation on the intercardinal headings

Quadrantal spheres are soft iron correctors placed on brackets on either side of the binnacle. They are specifically designed to compensate for induced magnetism in the ship's horizontal soft iron, which causes deviation on intercardinal headings (NE, SE, SW, NW) as the vessel changes its orientation relative to the Earth.