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What does the term "significant point" mean?
  • A
    A signal indicating the direction of the runway-in-use.
  • B
    A specified geographical position used in defining an ATS route or the flight path of an aircraft and for other navigation and ATS purposes.
  • C
    A defined position on an aerodrome used for the calibration of the inertial navigation system.
  • D
    A specified geographical position used to define an area navigation route or the flight path of an aircraft employing area navigation.

ICAO Doc 4444
Chapter 1 DEFINITIONS

Significant point. A specified geographical location used in defining an ATS route or the flight path of an aircraft and for other navigation and ATS purposes.

Note: There are three categories of significant points: ground-based navigation aid, intersection and waypoint. In the context of this definition, intersection is a significant point expressed as radials, bearings and/or distances from ground-based navigation aids.

Waypoint. A specified geographical location used to define an area navigation route or the flight path of an aircraft employing area navigation. Waypoints are identified as either:

Fly-by waypoint. A waypoint which requires turn anticipation to allow tangential interception of the next segment of a route or procedure, or

Flyover waypoint. A waypoint at which a turn is initiated in order to join the next segment of a route or procedure.

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