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OpenSeaMap is a software project collecting freely usable nautical information and geospatial data to create a worldwide nautical chart. This chart is available on the OpenSeaMap website, and can also be downloaded for use as an electronic chart for offline applications. [1] The project is part of OpenStreetMap.
A nautical chart or hydrographic chart is a graphic representation of a sea region or water body and adjacent coasts or banks. Depending on the scale of the chart, it may show depths of water (bathymetry) and heights of land (topography), natural features of the seabed, details of the coastline, navigational hazards, locations of natural and ...
Rutter (nautical) A rutter is a mariner's handbook of written sailing directions. Before the advent of nautical charts, rutters were the primary store of geographic information for maritime navigation. It was known as a periplus ("sailing-around" book) in classical antiquity and a portolano ("port book") to medieval Italian sailors in the ...
Portolan charts are nautical charts, first made in the 13th century in the Mediterranean basin and later expanded to include other regions. The word portolan comes from the Italian portolano, meaning "related to ports or harbors ", and which since at least the 17th century designates "a collection of sailing directions".
Nautical charts and textual descriptions known as sailing directions have been in use in one form or another since the sixth century BC. [14] Nautical charts using stereographic and orthographic projections date back to the second century BC. [14] In 1900, the Antikythera mechanism was recovered from Antikythera wreck. This mechanism was built ...
Gig Harbor kids’ sailing program fears losing its home base. Julia Park. August 5, 2024 at 1:00 PM. Seals popped their heads above the water as a fleet of small sailboats from West Shore Marina ...
Publisher. National Ocean Service. United States Coast Pilot is a ten-volume American navigation publication distributed yearly by the Office of Coast Survey, a part of the National Oceanic and Atmospheric Administration 's National Ocean Service. The purpose of the publication is to supplement nautical charts of the waters of the United States.
Polar diagram (sailing) Downwind polar diagram to determine potential yacht speeds at various wind speeds for a sailboat. A polar diagram, or polar plot, is a graph that shows a sailboat 's potential speed over a range of wind speeds and relative wind angles. [1] It normally consists of the right side of a line chart with the radius ...