RNAV is a method of navigation which permits aircraft operations on any desired flight path within the coverage of station referenced navigation aids or the limits of the capability of self-contained aids, or any combination thereof. Airborne RNAV equipment automatically determines aircraft position by processing data from one or more sensors and guides the aircraft in accordance with appropriate routing instructions.
Additional navigation parameters such as distance and bearing to a preselected waypoint can also be computed from the aircraft position and the location of the waypoint, depending upon the capability of the RNAV equipment. Position can be displayed to the pilot in various ways, most practically in terms of the aircraft position relative to the precomputed desired track. Most RNAV equipment can employ any lateral displacementof the aircraft from the desired track to generate track guidance signals to the auto-pilot. With other less sophisticated RNAV equipment manual corrective action is taken by the pilot.
B(asic)-RNAV defines European RNAV operations which satisfy a required track keeping accuracy of +5NM for at least 95% of the flight time. This level of navigation accuracy is comparable with that which can be achieved by conventional navigation techniques on ATS routes defined by VOR/DME, when VORs are less than 100 NM apart.
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