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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 ...
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 ...
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 ...
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.
In nautical terms, the word sound is used to describe the process of determining the depth of water in a tank or under a ship. Tanks are sounded to determine if they are full (for cargo tanks) or empty (to determine if a ship has been holed) and for other reasons.
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.
Retrieved from "https://en.wikipedia.org/w/index.php?title=Lead_line_(nautical)&oldid=1032658570"
These devices have a depth gauge sensor, provide a dive profile, and safety alerts for fast ascents and mandatory safety stops using the depth data. In 2023, University of Washington researchers demonstrated a fourth class of 3D underwater positioning for these smart devices that does not require infrastructure support like buoys. [ 21 ]
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