Which instrument is primarily used to show an aircraft's position relative to a desired course?

• A. Airspeed indicator
• B. Pitch indicator
• C. Course deviation indicator
• D. Vertical speed indicator

Answer: (C)

The course deviation indicator is designed specifically to show an aircraft's position relative to a desired course. This instrument helps pilots determine if they are on track with their flight path or if they need to make adjustments to their course. It displays the aircraft's lateral position concerning a predefined flight route, assisting in navigating accurately toward a destination.

In contrast, the airspeed indicator provides information on the aircraft's speed through the air, which is critical for safety and performance but does not indicate positional information related to a desired course. The pitch indicator shows the aircraft's angle of ascent or descent, while the vertical speed indicator measures the rate of climb or descent, both of which are essential for flight dynamics but do not address course navigation. Thus, the course deviation indicator is the primary instrument for tracking an aircraft's position relative to its desired course.