Plain English Meaning

Information that tells the pilot whether the aircraft is descending at the right angle to reach the runway, or whether it is too high or too low.

Full Definition

Vertical guidance data provided to a pilot during a precision radar approach (PAR), indicating the aircraft's position relative to the correct descent angle to the runway. The controller compares the aircraft's actual descent profile against the published glidepath and issues advisories such as ',' ',' or '' so the pilot can the correct .