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Unalaska Airport has one runway designated 13/31 with an asphalt surface measuring 4,500 by 100 feet (1,372 x 30 m). [1] There is a microwave landing system (MLS) approach. [1]
A group of boaters and programmers decided to extend the coverage of OpenStreetMap to the seas and fresh water bodies. From the start the project has been worldwide and multilingual. By the end of 2009, the design and architecture of the project had been created, and a sample harbor "Warnemünde" was created to serve as an example chart. Since ...
A time–distance diagram is a chart with two axes: one for time, the other for location. The units on either axis depend on the type of project: time can be expressed in minutes (for overnight construction of railroad modification projects such as the installation of switches) or years (for large construction projects); the location can be (kilo)meters, or other distinct units (such as ...
Small craft using the Intracoastal Waterway and small harbors not normally used by oceangoing vessels need it to keep charts and publications up-to-date. Since correcting information for U.S. charts in the notice to mariners is obtained from the Coast Guard local notices, it is normal to expect a lag of one or two weeks for the notice to ...
If a navigator begins at P 1 = (φ 1,λ 1) and plans to travel the great circle to a point at point P 2 = (φ 2,λ 2) (see Fig. 1, φ is the latitude, positive northward, and λ is the longitude, positive eastward), the initial and final courses α 1 and α 2 are given by formulas for solving a spherical triangle
[8]: 10 [9] The most common chart size was early established as the "Double-elephant", about 39 X 25.5 inches, and this has continued to be the case. [10] Chart design gradually simplified over the years, with less detail on land, focusing on features visible to the mariner. Contours were increasingly used for hills instead of hatching.
Fairway is a part of a water body (bay, harbor, river) containing the navigable channel (also known as a ship channel), a route suitable for ships of the larger size [1] (with draft closer to the draft limit).
An early isochrone map of Melbourne rail transport travel times, 1910–1922. Early examples of Isochrone maps include the Galton's Isochronic Postal Charts and Isochronic Passage Charts of 1881 and 1882, [8] Bartholomew's Isochronic Distance Map and Chart first published 1889, [9] and Albrecht Penck's Isochronenkarte first published 1887. [10]