nautical chart definition

LEEWAY – The sideways movement of the boat caused by either wind or current. One study[22] concludes that portolans originated from earlier charts drawn on what is now called the Mercator projection, states that portolans are mosaics of smaller charts, each with their own scale and orientation, and suggests that the cartographic capabilities of whichever civilization produced the antecedent charts was more advanced than is currently acknowledged. Common chart datums are lowest astronomical tide and mean lower low water.In non-tidal areas, e.g. A chart is used by mariners to plot courses through open bodies of water as well as in highly trafficked areas. A nautical chart is a graphic representation of a sea area and adjacent coastal regions. SWAMP – To fill with water, but not settle to the bottom. …improbable that any sort of sea chart was used with these sailing guides, even though Herodotus’s map of the known world, drawn in the 5th century, …headland; they did not require charts until adoption of the magnetic compass made it possible to proceed directly from one port to another. Also called North Geographic Pole. AIDS TO NAVIGATION (AtoN) – Artificial objects to supplement natural landmarks to indicate safe and unsafe waters. The practice of voyage planning has evolved from penciling lines on nautical charts to a process of risk management. The appearance of the magnetic compass 100 years earlier is considered to have been the catalyst for the development of charts. PILOTING – Navigation by use of visible references, the depth of the water, etc. EYE OF THE WIND – The direction from which the wind is blowing. BUOY – An anchored float used for marking a position on the water or a hazard or a shoal and for mooring. A nautical chart presents most of the information used by the marine navigator, including latitude and longitude scales, topographical features, navigation aids such as lighthouses and radio beacons, magnetic information, indications of reefs and shoals, water depth, and warning notices. During nautical twilight, the geometric center of the Sun's disk is between 6 and 12 degrees below the horizon. It also includes nautical charts that depict latitude scales and have been called “latitude charts” by other authors to distinguish them from proper portolan charts, which are believed to have been constructed on the basis of dead reckoning information. What does nautical chart mean? ANCHORAGE – A place suitable for anchoring in relation to the wind, seas and bottom. Nautical charting may take the form of charts printed on paper or computerised electronic navigational charts. The fifteenth-century Luxoro Atlas, whose authorship is anonymous, is held at the Biblioteca Civica Berio in Genoa. LUBBER’S LINE – A mark or permanent line on a compass indicating the direction forward; parallel to the keel when properly installed. Define nautical chart. Definition. ABEAM – At right angles to the keel of the boat, but not on the boat. The term “map,” on the other hand, emphasizes landforms and encompasses various geographic and cartographic products. STANDS4 LLC, 2020. STAND-ON VESSEL – That vessel which continues its course in the same direction at the same speed during a crossing or overtaking situation, unless a collision appears imminent. TRUE WIND – The actual direction from which the wind is blowing. When it comes aboard a vessel and is put to use, it becomes a line. Omissions? WATERLINE – A line painted on a hull which shows the point to which a boat sinks when it is properly trimmed. QUARTER – The sides of a boat aft of amidships. DISPLACEMENT – The weight of water displaced by a floating vessel. With each daily download, critical data such as Local Notice to Mariners is added to the on-demand chart files so that these charts will be up to date at the time of printing. Daymarks usually have reflective material indicating the shape, but may also be lighted. Also called a reef knot. GUNWALE – The upper edge of a boat’s sides. In his "buxolarum" [=magnetic compass] workshop he was helped by his son Jafuda. The newest of the Cresques World Map is the representation of Asia, from the Caspian sea to Cathay (China), which takes into account information from Marco Polo, and Jordanus . The masterpiece of the Majorcan portolan charts is the Catalan Atlas made by Abraham Cresques in 1375, and kept in the Bibliothèque Nationale de France in Paris. FLARE – The outward curve of a vessel’s sides near the bow. The term “map,” on the other hand, emphasizes landforms and encompasses various geographic and cartographic products. Cartometric investigation has revealed that no projection was used in the early charts…"[11], The straight lines shown criss-crossing portolan charts represent the sixteen directions (or headings) of the mariner's compass from a given point, which became thirty-two directions since around 1450. One definition is a small craft carried aboard a ship. LOG – A record of courses or operation. INBOARD – More toward the center of a vessel; inside; a motor fitted inside the boat. [1] Portolans were most useful in close quarters' identification of landmarks. SPRING LINE – A pivot line used in docking, undocking, or to prevent the boat from moving forward or astern while made fast to a dock. Recent technologies have made available paper charts which are printed "on demand" with cartographic data that has been downloaded to the commercial printing company as recently as the night before printing. See: hydrographic chart. Dictionary of Military and Associated Terms. FLAME ARRESTER – A safety device, such as a metal mesh protector, to prevent an exhaust backfire from causing an explosion; operates by absorbing heat. Tar and resin used for caulking between the planks of a wooden vessel. PAY OUT – To ease out a line, or let it run in a controlled manner. Arab portolan charts were not recognized until the second half of the 20th century. ATHWARTSHIPS – At right angles to the centerline of the boat; rowboat seats are generally athwartships. nautical chart synonyms, nautical chart pronunciation, nautical chart translation, English dictionary definition of nautical chart. A shallow bay. AGROUND – Touching or fast to the bottom. Because of its critical importance in promoting safe navigation, the nautical chart has a certain level of legal standing and authority. PLANING HULL – A type of hull shaped to glide easily across the water at high speed. PORT – The left side of a boat looking forward. ANCHOR – A heavy metal device, fastened to a chain or line, to hold a vessel in position, partly because of its weight, but chiefly because the designed shape digs into the bottom. DEAD RECKONING – A plot of courses steered and distances traveled through the water. Single charts were normally rolled whereas those that formed part of atlases were pasted on wood or cardboard supports. Usually U-shaped to reduce chafe. ABEAM – At right angles to the keel of the boat, but not on the boat. The term “portolan chart” was coined in the 1890s because at the time it was assumed that these maps were related to portolani, medieval or early modern books of sailing directions. These were plane charts (taking no account of the Earth’s curvature) that were regularly crossed by rhumb lines, or loxodromes, that corresponded to the direction from which the wind was likely to blow. VARIATION – The angular difference between the magnetic meridian and the geographic meridian at a particular location. The Spanish introduced a novelty in nautical cartography, with geographical maps having common stylistic representation of certain accidents and locations. PITCHPOLING – A small boat being thrown end-over-end in very rough seas. The portolan chart combined the exact notations of the text of the periplus or pilot book with the decorative illustrations of a medieval T and O map. Let us know if you have suggestions to improve this article (requires login). To the next century belong the Carignano Chart, disappeared from the National Archive of Florence where it had been conserved for a long time; cartographic works of the Genoese Pietro Vesconte, the illustrator of the work of Marino Sanudo; the chart of Francisco Pizigano (1373), with stylistic influence from Mallorca; and those of Beccario, Canepa and the brothers Benincasa, natives of Ancona. Get instant definitions for any word that hits you anywhere on the web! Such information allows both plotting a safe course and …

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