Aircraft Operations

Chapter 1
GENERAL INFORMATION FOR RNAV SYSTEMS
1.1 In RNAV guidance systems, a computer converts navigation data inputs into aircraft position, calculates track
and distance and provides steering guidance to the next waypoint. The limitations of RNAV systems are those of the
computers on which they are based.
1.2 The computer is programmed so that calculation errors are minimal and do not affect the accuracy of the
output significantly. The computer, however, cannot identify data input errors.
1.3 Since the waypoint and, in some cases, data contained in the navigation database, have been calculated and
promulgated by States and inserted by the operator or crew, the actual computed position will contain any errors that
they have introduced into the navigation database.
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II-1-1-1 23/11/06