What role does the Inertial Navigation System (INS) play in RNAV?

The Inertial Navigation System (INS) plays a significant role in the context of Area Navigation (RNAV) by serving as a primary navigation source. INS uses a combination of accelerometers and gyroscopes to calculate the position and movement of an aircraft. By continuously updating the aircraft's position based on its initial position and its own motion, it provides accurate and real-time navigation data.

In RNAV systems, the INS contributes to the overall navigation capability by ensuring that the aircraft can navigate through various air routes without requiring ground-based navigation aids. This independence from ground signals allows for greater flexibility and efficiency in flight operations. Hence, while the INS can provide backup input in some configurations, its primary role in RNAV is as a critical component that directly influences the aircraft’s navigation and flight path planning.