Which term describes direct routes based on area navigation capability between waypoints defined in terms of latitude/longitude coordinates, degree-distance fixes, or offsets from established routes/airways at a specified distance and direction?

• A. Radio wave
• B. Ranging signals
• C. Random RNAV routes
• D. Radiosonde

Answer: (C)

Direct routes built with Area Navigation capability between waypoints defined by coordinates, degree-distance fixes, or offsets from established routes are RNAV routes. This concept means you can fly from one precise point to another without following traditional ground-based navaids, using GPS or other RNAV-capable navigation to determine position. The waypoints can be exact latitude/longitude coordinates, intersections defined by distance from a VOR or other navaid, or precise offsets from an airway, allowing a more direct and efficient path at a specified distance and direction. The other options don’t describe this routing concept: general radio wave or ranging signals refer to signals used for communication or navigation but not the routing method itself, and radiosonde is a weather instrument. Also, the standard term is RNAV routes, not “random RNAV routes.”