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2. Electronic navigational chart - Wikipedia

   en.wikipedia.org/wiki/Electronic_navigational_chart

   An Electronic Navigational Chart (ENC) is a digital representation of a real-world geographical area for the purpose of Marine navigation.Real-world objects and areas of navigational significance, or to a lesser degree - informational significance, are portrayed through Raster facsimiles of traditional paper charts; or more commonly through vector images, which are able to scale their relative ...

3. Navigational instrument - Wikipedia

   en.wikipedia.org/wiki/Navigational_instrument

   Marine chronometer used to determine time at the prime meridian with great precision which is necessary when reducing sights in celestial navigation. Nocturnal used to determine apparent local time by viewing the Polaris and its surrounding stars. Ring dial or astronomical ring used to measure the height of a celestial body above the horizon ...

4. Tachometer - Wikipedia

   en.wikipedia.org/wiki/Tachometer

   A tachometer that can indicate up to 7000 RPM (left) A tachometer (revolution-counter, tach, rev-counter, RPM gauge) is an instrument measuring the rotation speed of a shaft or disk, as in a motor or other machine. [1] The device usually displays the revolutions per minute (RPM) on a calibrated analogue dial, but digital displays are ...

5. Chartplotter - Wikipedia

   en.wikipedia.org/wiki/Chartplotter

   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.

6. Marine electronics - Wikipedia

   en.wikipedia.org/wiki/Marine_electronics

   In recent years, the International Electrotechnical Commission (IEC) has created a new standards suite for "Digital interfaces for navigational equipment within a ship". This is known as IEC 61162 and included NMEA 0183, NMEA 2000 and LWE. Additionally, different suppliers of marine electronics have their own communications protocol.

7. Marine chronometer - Wikipedia

   en.wikipedia.org/wiki/Marine_chronometer

   A marine chronometer is a precision timepiece that is carried on a ship and employed in the determination of the ship's position by celestial navigation. It is used to determine longitude by comparing Greenwich Mean Time (GMT), and the time at the current location found from observations of celestial bodies.