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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 ...
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 .
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 ...
16-ft Aids to Navigation Boat – Skiff (AB-SKF): LOA 16 ft, beam 6 ft 10 in, draft 6 in, fuel 12 US gal, weight 800 lb, 60 hp. The AB-SKF is deployed from Coast Guard cutters (ships) or Aids to Navigation Teams in support of mission activities primarily in support of aid to navigation servicing, construction, repair and discrepancy response.
Diagram of a chip log attached to a log-line and reel on a ship. A chip log, also called common log, [1] ship log, or just log, is a navigation tool mariners use to estimate the speed of a vessel through water. The word knot, to mean nautical mile per hour, derives from this measurement method.
The Seakeeper is a specially designed gyroscope that helps eliminate motion sickness from any boat ride. This device will finally get rid of motion sickness on boats Skip to main content
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A pelorus is useful, for instance, in determining the moment at which an aid to navigation is broad on the beam. It is also useful in measuring pairs of relative bearings which can be used to determine distance off and distance abeam of a navigational aid. If the true heading is set at the lubber's line, true bearings are observed directly.
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