What is the distinguishing feature of RNAV systems?

The distinguishing feature of RNAV (Area Navigation) systems is that they allow navigation along a direct route between any two points. This capability is a fundamental aspect of RNAV, which enables aircraft to fly more efficient flight paths rather than being constrained by the location of traditional ground-based navigational aids.

RNAV systems utilize a combination of onboard navigation databases, GPS signals, and other navigational technology to compute flight paths, thus providing the flexibility to create direct routes that enhance operational efficiency and reduce flight times. This flexibility is a key reason why RNAV systems have been widely adopted in the aviation industry, allowing aircraft to navigate more freely in three-dimensional airspace.

Options that refer to signals from satellites emphasize one aspect of RNAV, but don't capture its primary functionality regarding route efficiency. While measuring deviations from a course is important in navigation, it does not define RNAV systems specifically. Similarly, the reference to complex ground infrastructure highlights the contrast between RNAV and older navigation methods but is not a feature that characterizes RNAV itself. The essence of RNAV systems lies in their ability to provide direct routing capabilities, making them a critical advancement in modern aviation.