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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).
Thus, one may see only external borders within the chart, with the 1,200-foot (370 m) region extending off the chart. When class E airspace begins at altitudes other than 1,200 feet (370 m) AGL, 700 feet (210 m) AGL, or 14,500 feet (4,400 m) MSL, a delimiting border resembling links in a chain in dark cyan separates the areas, and specific ...
MEF's of 4700 and 3300 feet are shown on this excerpt from the FAA's Los Angeles sectional aeronautical chart. Maximum elevation figure ( MEF ) is a type of visual flight rule (VFR) information that indicates the elevation of the highest geographical feature within a GEOREF quadrangle area.
Class A airspace is generally the airspace from 18,000 feet (~3.4 miles, 5.5 km) mean sea level (MSL) up to and including flight level (FL) 600 (~11.4 miles, 18.3 km), including the airspace overlying the waters within 12 nautical miles (NM) (~13.8 miles, 22.2 km) of the coast of the 48 contiguous states and Alaska. Unless otherwise authorized ...
In the United States, Victor airways are designated by the FAA in FAA Order JO 7400.11. [2] They are available for flight up to, but not including, 18,000ft MSL (above mean sea level) [3] under either instrument flight rules (IFR) or visual flight rules (VFR). Victor airways have minimum (and possibly maximum) altitudes for IFR operations ...
The world's navigable airspace is divided into three-dimensional segments, each of which is assigned to a specific class. Most nations adhere to the classification specified by the International Civil Aviation Organization (ICAO) and described below, though they might use only some of the classes defined below, and significantly alter the exact rules and requirements.
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In the US, there are specific VFR cruising altitudes, based on the aircraft's course, to assist pilots in separating their aircraft while operating under visual flight above 3,000 ft above the surface (AGL) but below 18,000 ft Mean Sea Level (MSL). Unofficially, most pilots use these rules at all levels of cruise flight.