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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).
The innermost ring with a radius of 5 nautical miles (9 km) typically extends from the surface area around the airport to 4,000 feet (1,220 m) AGL (above ground level; charted in MSL), and an outer ring, with a radius of 10 nautical miles (19 km) that typically surrounds the inner ring and extends from a floor at 1,200 feet (370 m) AGL, (also ...
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 ...
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 ...
Airspace class Time Altitude Surface to 1200 feet AGL [b] 1200 feet AGL to 10,000 feet MSL 1200 feet AGL and above 10,000 feet MSL; Visibility [c] Clearance from clouds [d] Visibility [c] Clearance from clouds [d] Visibility [c] Clearance from clouds [d] G Day 1 [e] clear of clouds [f] 1: 500 below, 1000 above, 2000 horizontally 5: 1000 below ...
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For VFR operations, victor airways are just a subset of so-called Federal airways (which also include so-called colored airways), which are designated as Class E, and hence are extended from 1,200 feet (370 m) above ground level (AGL) up to, but not including, 18,000 feet (5,500 m) above mean sea level (AMSL).
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