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NMEA 2000, abbreviated to NMEA2k or N2K and standardized as IEC 61162-3, is a plug-and-play communications standard used for connecting marine sensors and display units within ships and boats. Communication runs at 250 kilobits-per-second and allows any sensor to talk to any display unit or other device compatible with NMEA 2000 protocols.
The vessel's clearance is the distance in excess of the air draft which allows a vessel to pass safely under a bridge or obstacle such as power lines, etc.A bridge's "clearance below" is most often noted on charts as measured from the surface of the water to the underside of the bridge at the chart datum Mean High Water (MHW), [3] [4] a less restrictive clearance than Mean Higher High Water ...
Two dozen boats are planned that will be larger and faster, with a longer range and twice the capacity over Mike Boats. The MSV(L) will be roughly 100 feet (30 m) long, with a draft of less than four feet, a speed of 18 knots and the capacity to carry either an M1 Abrams tank, two Strykers with add-on armor, or four Joint Light Tactical Vehicles .
At high frequency settings, high chart speeds, such fathometers give a picture of the bottom and any intervening large or schooling fish that can be related to position. Fathometers of the constant recording type are still mandated for all large vessels (100+ tons displacement) in restricted waters (i.e. generally, within 15 miles (24 km) of land).
This is a list of boat types. For sailing ships, see: List of sailing boat types
These range from 2-, 3-, and 4-cylinder models generating 15 to 135 horsepower (11 to 101 kW) suitable for hulls up to 17 feet (5.2 m) in length to powerful V6 and V8 cylinder blocks rated up to 627 hp (468 kW)., [2] with sufficient power to be used on boats of 37 feet (11 m) or longer.
On nautical charts, the top of the chart is always true north, rather than magnetic north, towards which a compass points. Most charts include a compass rose depicting the variation between magnetic and true north. However, the use of the Mercator projection has drawbacks. This projection shows the lines of longitude as parallel.
Name Number built Year of first construction Designer Builder Notes 420: 56,000: 1959: Christian Maury: Several [12] [13]470: 1963 Christian Maury Several [14] [15]505: 1954