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An en-route (also known as en route [1] or enroute [2]) chart provides detailed information useful for instrument flight, including information on radionavigation aids (navaids) such as VORs and NDBs, navigational fixes (waypoints and intersections), standard airways, airport locations, minimum altitudes, and so on.
Minimum en route altitude (MEA), [1] alternately spelled as Minimum enroute altitude, [2] is the lowest published altitude between radio navigation fixes that assures acceptable navigational signal coverage (see MRA) and meets obstacle clearance requirements (see MOCA) between those fixes.
All airspace above FL195 is class C controlled airspace, the equivalent to airways being called Upper Air Routes and having designators prefixed with the letter "U". If an upper air route follows the same track as an airway, its designator is the letter "U" prefix and the designator of the underlying airway.
Within the route log, "U.S. Route" is used in the table of contents, while "United States Highway" appears as the heading for each route. All reports of the Special Committee on Route Numbering since 1989 use "U.S. Route", and federal laws relating to highways use "United States Route" or "U.S. Route" more often than the "Highway" variants.
Indian route: Highways found in several Indian reservations. U.S. Bicycle Route: Part of the national cycling route network in the U.S., consisting of interstate long-distance cycling routes that use multiple types of bicycling infrastructure, including off-road paths, bicycle lanes, and low-traffic roads.
Route 257 at the Canadian border in Pittsburg, NH: 1926: current US 4: 252.62: 406.55 US 9, US 20 southeast of Albany, NY: I-95/Blue Star Turnpike, Spaulding Turnpike, US 1 Byp., NH 16 in Portsmouth, NH: 1926: current Signed north–south in New York US 5: 300: 480 I-91 in New Haven, CT: Route 143 at the Canadian border in Derby Line, VT
They generally include basic information such as departure and arrival points, estimated time en route, alternate airports in case of bad weather, type of flight (whether instrument flight rules [IFR] or visual flight rules [VFR]), the pilot's information, number of people on board, and information about the aircraft itself. In most countries ...
en route weather updates collection [ 1 ] of pilot weather reports (PIREPs) The service was available on a single common frequency, 122.0 MHz , to flights operating below Flight Level 180 (18,000 feet MSL ) across the conterminous United States. [ 2 ]