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  2. Height above mean sea level - Wikipedia

    en.wikipedia.org/wiki/Height_above_mean_sea_level

    Elevation or altitude is generally expressed as "metres above mean sea level" in the metric system, or "feet above mean sea level" in United States customary and imperial units. Common abbreviations in English are: AMSLabove mean sea level [3] ASL – above sea level [4] FAMSL – feet above mean sea level [5] FASL – feet above sea level [6]

  3. Sea level - Wikipedia

    en.wikipedia.org/wiki/Sea_level

    A common and relatively straightforward mean sea-level standard is instead a long-term average of tide gauge readings at a particular reference location. [1] The term above sea level generally refers to the height above mean sea level (AMSL). The term APSL means above present sea level, comparing sea levels in the past with the level today.

  4. List of aviation, avionics, aerospace and aeronautical ...

    en.wikipedia.org/wiki/List_of_aviation,_avionics...

    AMSL Above mean sea level: AMP Aircraft maintenance program AMT Aircraft Maintenance Technician: ANC Active noise cancellation AND Aircraft Nose Down ANN Annunciator panel: Caution warning system normally containing visual and audio alerts to the pilot ANPT Aeronautical national pipe taper ANR Active noise reduction ANSP 1: Air navigation ...

  5. Height above ground level - Wikipedia

    en.wikipedia.org/wiki/Height_above_ground_level

    In aviation, atmospheric sciences and broadcasting, a height above ground level (AGL [1] or HAGL) is a height measured with respect to the underlying ground surface.This is as opposed to height above mean sea level (AMSL or HAMSL), height above ellipsoid (HAE, as reported by a GPS receiver), or height above average terrain (AAT or HAAT, in broadcast engineering).

  6. Glossary of gliding and soaring - Wikipedia

    en.wikipedia.org/wiki/Glossary_of_gliding_and...

    A unit of speed. While the knot is commonly used in aviation and other contexts as an abbreviation of nautical miles per hour, in soaring the knot is also used to describe lift (and sink conditions). Using approximations, one knot of upward velocity in a thermal equates to roughly 100 feet per minute of climb. [2] LOA

  7. Altimeter setting - Wikipedia

    en.wikipedia.org/wiki/Altimeter_setting

    It is the setting that causes an altimeter to read the aircraft's flight level (FL). Flight levels are given in hundreds of feet (for example: FL100 = 10 000 ft). Atmospheric pressure changes over time and position. Thus, the flight level is not "straight", because it has a different altitude (elevation above the mean sea level).

  8. AMSL (disambiguation) - Wikipedia

    en.wikipedia.org/wiki/AMSL_(disambiguation)

    AMSL is an acronym for "Above Mean Sea Level", the elevation of a location above a standardized sea level. AMSL may also refer to: Alberta Major Soccer League, a Canadian soccer league; Airbus Military Sociedad Limitada, a former aerospace company based in Spain; Aéroport Montréal Saint-Hubert Longueuil, a Canadian airport

  9. National Geodetic Vertical Datum of 1929 - Wikipedia

    en.wikipedia.org/wiki/National_Geodetic_Vertical...

    Since the Sea Level Datum of 1929 was a hybrid model, it was not a pure model of mean sea level, the geoid, or any other equipotential surface. Therefore, it was renamed the National Geodetic Vertical Datum of 1929 (NGVD 29) May 10, 1973, by the National Geodetic Survey , a part of the National Oceanic and Atmospheric Administration .