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The first reference to a Dutchman's log is in 1623—later than the ship log. [4] The Dutchman's log could be used with a brass tobacco box, rectangular with rounded ends. This box had tables on it to convert log timing to speed. [5] [6] Mariners have used the log for a long time.
A Raymarine chartplotter. A chartplotter is a device used in marine navigation that integrates GPS data with an electronic navigational chart (ENC).. The chartplotter displays the ENC along with the position, heading and speed of the ship, and may display additional information from radar, automatic information systems (AIS) or other sensors.
To counter this effect, more advanced navigation systems use additional sensors like a compass or an inertial navigation system to complement GPS. Doppler Velocity Log (DVL): Some ships are equipped with sonar instruments that can measure the Doppler shift in a sound pulse generated by the ship's motion as it reflects off the ocean bottom or ...
In January 2001, Raymarine was formed when the division was acquired in a management buy-out backed by Hg. [4] In December 2004 the company was floated on the London Stock Exchange quadrupling Hg's investment. [5] In 2005, the company was involved in Ellen MacArthur's solo world circumnavigation. [6]
The term digital anchor has been used to describe such dynamic positioning systems. [4]. The applications and availability depends on the type of work and water depth. The most common position reference systems (PRS) and position measuring systems (PME) are: GPS satellite in orbit. DGPS, Differential GPS. The position obtained by GPS is not ...
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.