What is the main feature of DME/DME RNAV?

The main feature of DME/DME RNAV (Distance Measuring Equipment/Distance Measuring Equipment Area Navigation) lies in its method of calculating position using the signals from two DME stations. DME is a system that provides accurate distance information from the aircraft to specific ground-based stations, allowing pilots to determine their position relative to these stations.

In this system, the aircraft measures the distance to two or more DME stations, which enables it to triangulate its position without relying solely on visual cues or satellite data. This method enhances navigation accuracy and allows for effective position determination, especially in areas where traditional navigation aids may not be available.

Using two DME stations is crucial because it ensures that the aircraft can maintain a reliable navigational fix, which is essential for both en-route navigation and when approaching or departing from airports. The reliance on ground-based infrastructure rather than satellite data also makes DME/DME RNAV an important tool in regions where satellite navigation may be less effective.