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2. Depth sounding - Wikipedia

   en.wikipedia.org/wiki/Depth_sounding

   A sounding line or lead line is a length of thin rope with a plummet, generally of lead, at its end. Regardless of the actual composition of the plummet, it is still called a "lead". Leads were swung, or cast, by a leadsman, usually standing in the chains of a ship, up against the shrouds. [4] Measuring the depth of water by lead and line dates ...

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. Navigational aid - Wikipedia

   en.wikipedia.org/wiki/Navigational_aid

   A navigational aid (NAVAID), also known as aid to navigation (ATON), is any sort of signal, markers or guidance equipment which aids the traveler in navigation, usually nautical or aviation travel. Common types of such aids include lighthouses , buoys , fog signals , and day beacons .

5. Long baseline acoustic positioning system - Wikipedia

   en.wikipedia.org/wiki/Long_Baseline_Acoustic...

   Submarines typically are guided by inertial navigation systems, but these dead reckoning systems develop position drift which must be corrected by occasional position fixes from a GNSS system. If the enemy were to knock out the GNSS satellites, the submarine could rely on the covert transponder network to establish its position and program the ...

6. Lead line (nautical) - Wikipedia

   en.wikipedia.org/?title=Lead_line_(nautical...

   Retrieved from "https://en.wikipedia.org/w/index.php?title=Lead_line_(nautical)&oldid=1032658570"

7. Marine electronics - Wikipedia

   en.wikipedia.org/wiki/Marine_electronics

   Therefore, the majority of these types of devices are either water resistant or waterproof. Marine electronics devices include chartplotter, marine VHF radio, autopilot and self-steering gear, fishfinder and sonar, marine radar, satellite navigation device, fibre optic gyrocompass, satellite television, and marine fuel management.