Compass deviation is defined as the angle between which of the following?

Compass deviation refers to the difference between the direction indicated by a magnetic compass and the actual magnetic direction. It specifically relates to the internal errors or inaccuracies of the compass instrument itself, influenced by local magnetic fields such as those created by electrical equipment, metal structures, or other nearby magnetic influences on the vessel or aircraft.

In this context, the correct understanding is that compass deviation is defined as the angle between Magnetic North, which is the direction a magnetic compass points due to the Earth's magnetic field, and compass North, which is the direction indicated by the compass itself. The effect of deviation means that the compass may not accurately reflect Magnetic North due to these internal errors, leading to potential navigation issues.

Understanding this definition is crucial for navigators, as it emphasizes the need to correct for deviation when determining true headings and ensuring accurate navigation.