What does a course deviation indicator (CDI) assist the pilot with?

• A. Determining fuel consumption
• B. Maintaining accurate navigation
• C. Calculating payload weight
• D. Measuring altitude

Answer: (B)

A course deviation indicator (CDI) is an essential navigational instrument that assists pilots in maintaining accurate navigation. It displays the aircraft's position relative to a selected course, helping the pilot determine whether they are on the intended flight path or if they need to make adjustments.

When flying a specific course, the CDI provides visual feedback on the aircraft's alignment with that course. If the aircraft deviates from the path, the indicator will show the direction and extent of the deviation. The pilot can then use this information to make the necessary corrections, ensuring that they remain on course and facilitating effective navigation throughout the flight.

The other options are related to aviation but do not pertain to the primary function of the CDI. Fuel consumption, payload weight calculation, and altitude measurement involve different instruments and systems, illustrating that the CDI's sole focus is on navigation accuracy.