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An aeronautical chart is a map designed to assist in the navigation of aircraft, much as nautical charts do for watercraft, or a roadmap does for drivers. Using these charts and other tools, pilots are able to determine their position, safe altitude, best route to a destination, navigation aids along the way, alternative landing areas in case of an in-flight emergency, and other useful ...
A nautical mile is a unit of length used in air, marine, and space navigation, and for the definition of territorial waters. [2] [3] [4] Historically, it was defined as the meridian arc length corresponding to one minute ( 1 / 60 of a degree) of latitude at the equator, so that Earth's polar circumference is very near to 21,600 nautical miles (that is 60 minutes × 360 degrees).
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 ...
A World Aeronautical Chart (WAC) was a type of aeronautical chart used for navigation by pilots of moderate speed aircraft and aircraft at high altitudes in the United States. They are at a scale of 1:1,000,000 (about 1 inch = 13.7 nautical miles or 16 statute miles).
Certain class B airports have a mode C veil, which encompasses airspace within thirty nautical miles of the airport. Aircraft operating within the Mode C veil must have an operating Mode C transponder (up to 10,000 feet (3,000 m) MSL) unless the aircraft is certified without an engine-driven electrical system, operates outside the class B ...
Sri Lanka Air Force bases SLAF Anuradhapura, SLAF Hingurakgoda, SLAF Vavuniya, SLAF Palaly and SLAF Sigiriya (5 nautical miles, 9.3 km) Jaffna town (5 nautical miles, 9.3 km) Trincomalee harbour (5 nautical miles, 9.3 km) SLAF China Bay (10 nautical miles, 19 km) The garrison town of Diyatalawa (2 nautical miles, 3.7 km) Temple of the Tooth ...
As a result, nautical miles and knots are convenient units to use when navigating an aircraft or ship. On a standard nautical chart using Mercator projection, the horizontal (East–West) scale varies with latitude. On a chart of the North Atlantic, the scale varies by a factor of two from Florida to Greenland.
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 ...