What does the term 'ANDs' refer to in magnetic compass errors?

The term 'ANDs' in the context of magnetic compass errors refers specifically to the concept of "Accelerate North, Decelerate South." This mnemonic helps pilots remember how the magnetic compass behaves during changes in aircraft speed.

When an aircraft accelerates on a northward heading, the compass will indicate a turn toward the north, which is known as a compass error due to acceleration. Conversely, when the aircraft is decelerating on a southward heading, the compass will lag and show a turn toward the south. Understanding this behavior is crucial for pilots to interpret compass readings accurately during flight, ensuring they maintain proper navigation and orientation.

Other choices, while constructed to sound similar, do not accurately reflect the relationship between aircraft acceleration and compass behavior. They include terms that do not align with the traditional understanding of compass errors, making them less relevant for pilot training and practical navigation. Recognizing the correct acronym helps in remembering and effectively managing compass errors during flight operations.