Which statement best describes the relationship between EFIS, FMS, and RNAV?

Which statement best describes the relationship between EFIS, FMS, and RNAV?

• A. EFIS controls engine data; FMS displays maps; RNAV calculates fuel
• B. EFIS is for weather; RNAV is for communication
• C. EFIS displays flight information; FMS acts as the brain; RNAV provides attitude and navigation data to FMS
• D. EFIS and RNAV are the same; FMS is unrelated

Answer: (C)

The question tests how EFIS, FMS, and RNAV relate in the cockpit. EFIS is the display system that presents flight information to you on the screens—things like attitude, altitude, airspeed, vertical speed, and navigation cues. The FMS is the central processor that plans the flight, optimizes the route, and manages navigation and performance data to guide the aircraft along the chosen path. RNAV provides the navigation data and the flight path information that the FMS uses to execute the route. So the best statement fits because it matches these roles: EFIS primarily displays flight information you monitor; FMS acts as the brain that uses inputs (route, performance) to control the flight; RNAV supplies the navigation data and path guidance that the FMS uses to follow the route. The other options misstate core functions—EFIS isn’t for weather or engine data, RNAV isn’t for communication, and EFIS and RNAV aren’t the same nor is FMS unrelated.

The question tests how EFIS, FMS, and RNAV relate in the cockpit. EFIS is the display system that presents flight information to you on the screens—things like attitude, altitude, airspeed, vertical speed, and navigation cues. The FMS is the central processor that plans the flight, optimizes the route, and manages navigation and performance data to guide the aircraft along the chosen path. RNAV provides the navigation data and the flight path information that the FMS uses to execute the route.

So the best statement fits because it matches these roles: EFIS primarily displays flight information you monitor; FMS acts as the brain that uses inputs (route, performance) to control the flight; RNAV supplies the navigation data and path guidance that the FMS uses to follow the route. The other options misstate core functions—EFIS isn’t for weather or engine data, RNAV isn’t for communication, and EFIS and RNAV aren’t the same nor is FMS unrelated.