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2. 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.

3. GPS sonobuoy - Wikipedia

   en.wikipedia.org/wiki/GPS_sonobuoy

   Early GIBs were created for broad ocean area weapons testing by modifying conventional Navy sonobuoys with small OEM-grade GPS receivers and deploying them from a helicopter or from P-3 Orion aircraft. [3] [4] The GPS data captured by the GIB was modulated over the analog VHF acoustic data stream using frequency-shift keying (FSK). This allows ...

4. Fishfinder - Wikipedia

   en.wikipedia.org/wiki/Fishfinder

   This is because the distance between the fish and the transducer changes as the boat passes over the fish (or the fish swims under the boat). When the fish enters the leading edge of the sonar beam, a display pixel is turned on. As the fish swims toward the centre of the beam, the distance to the fish decreases, turning on pixels at shallower ...

5. AOL Mail

   mail.aol.com

   Get AOL Mail for FREE! Manage your email like never before with travel, photo & document views. Personalize your inbox with themes & tabs. You've Got Mail!

6. Chip log - Wikipedia

   en.wikipedia.org/wiki/Chip_log

   The timing sandglass is in the upper left and the chip log is in the lower left. The small light-coloured wooden pin and plug form a release mechanism for two lines of the bridle. From the Musée de la Marine, Paris. A chip log consists of a wooden board attached to a line (the log-line). The log-line has a number of knots at uniform intervals.

7. Submarine navigation - Wikipedia

   en.wikipedia.org/wiki/Submarine_navigation

   Surfaced submarines entering and leaving port navigate similarly to traditional ships but with a few extra considerations because most of the boat rides below the waterline, making them hard for other vessels to see and identify. Submarines carry an inertial navigation system, which measures the boat’s motion and constantly updates position ...