4. what's a THINGS

Probably the name of an intersection. They are five letters long, and are
supposed to be pronouncable. An intersection is (usually) defined by two VOR
radials, or a VOR radial and a DME (distance) from that VOR. Intersections are
used as waypoints - upon reaching such a waypoint, you can do something (like
descend) as charted in the approach procedure.

Jose

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