enow.com Web Search

Search results

1. Results from the WOW.Com Content Network

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

   All those mentioned were the traditional instruments used until well into the second half of the 20th century. After World War II electronic aids to navigation developed very rapidly and, to a great extent, replaced more traditional tools. Electronic speed and depth finders have totally replaced their older counterparts.

4. Chip log - Wikipedia

   en.wikipedia.org/wiki/Chip_log

   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.

5. Long baseline acoustic positioning system - Wikipedia

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

   LBL systems are unique in that they use networks of sea-floor mounted baseline transponders as reference points for navigation. These are generally deployed around the perimeter of a work site. The LBL technique results in very high positioning accuracy and position stability that is independent of water depth.

6. 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 .

7. Pelorus (instrument) - Wikipedia

   en.wikipedia.org/wiki/Pelorus_(instrument)

   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.