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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. Leading lights - Wikipedia

   en.wikipedia.org/wiki/Leading_lights

   Leading lights, also known as range lights in the United States, are a pair of light beacons used in navigation [2] to indicate a safe passage for vessels entering a shallow or dangerous channel; they may also be used for position fixing. At night, the lights are a form of leading line that can be used for safe navigation. The beacons consist ...

5. Lead line (nautical) - Wikipedia

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

   Navigation Main page; Contents; Current events; Random article; About Wikipedia; Contact us; Contribute Help; ... Depth sounding#Lead line; Retrieved from "https: ...

6. Kelvite sounding machine - Wikipedia

   en.wikipedia.org/wiki/Kelvite_sounding_machine

   The line was released, and when the sinker reached the bottom, the drum was held in place with a catch. The depth was then read from the dial. Printed tables were provided to calculate the depth of water when the ship was in motion; these showed variations for different forward speeds to allow for the wire's deviation from straight up-and-down.

7. Sound velocity probe - Wikipedia

   en.wikipedia.org/wiki/Sound_Velocity_Probe

   Early depth sounding was achieved using lead line sounding (or sounding line), where a lead weight attached to a length of rope marked with depth values.As this method was mechanical in nature, the only correction that was applied to the sounding was the reduction of the sounding for tidal height.