Heading - The direction in which the longitudinal axis of an aircraft is pointed, usually expressed in degrees from North (true, magnetic, compass or grid).
Height - The vertical distance of a level, a point or an object considered as a point, measured from a specified datum
Height above airport - The height of the Minimum Descent Altitude above the published airport elevation.
Height above touchdown - The height of the Decision Height or Minimum Descent Altitude above the highest runway elevation in the touchdown zone.
Holding procedure - A predetermined maneuver which keeps aircraft within a specified airspace while awaiting further clearance from air traffic control. Also used during ground operations to keep aircraft within a specified area or at a specified point while awaiting further clearance from air traffic control.
Holding point - HP - A specified location, identified by visual or other means, in the vicinity of which the position of an aircraft in flight is maintained in accordance with air traffic control clearances.
Homer – radio direction finding (DF) station equipped to provide a mobile stations with heading to steer (with no wind) to reach the station using radio transmission from the mobile station.