The height of the Decision Height or Minimum Descent Altitude above the highest runway elevation in the touchdown zone (first 3,000 feet of the runway). HAT is published on instrument approach charts in conjunction with all straight-in minimums.
Listed in the Pilot/Controller Glossary as a cross-reference to HEIGHT ABOVE TOUCHDOWN (HAT), whose text is shown above.
Source FAA Pilot/Controller Glossary · checked 2026-08-25