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2. Heading (navigation) - Wikipedia

   en.wikipedia.org/wiki/Heading_(navigation)

   These directions are expressed in degrees from 0–360°, and also fractions of a degree. The differences between these two directions at any point on the globe is magnetic variation (also known as magnetic declination, but for the purposes of the mnemonic, the term 'variation' is preferred). When a compass is installed in a vehicle or vessel ...

3. Great-circle navigation - Wikipedia

   en.wikipedia.org/wiki/Great-circle_navigation

   The unit directions u E, u N and the rotation axis ω are marked by arrows. Detailed evaluation of the optimum direction is possible if the sea surface is approximated by a sphere surface. The standard computation places the ship at a geodetic latitude φ s and geodetic longitude λ s , where φ is considered positive if north of the equator ...

4. Marine navigation - Wikipedia

   en.wikipedia.org/wiki/Marine_navigation

   Navigation (from the Latin word navigatio) is the act of sailing or voyaging.Nautical (from Latin nautĭca, and this from Greek ναυτική [τέχνη] nautikḗ [téjne] "[art of] sailing" and from ναύτης nautes "sailor") is that pertaining to navigation and the science and art of sailing.

5. Navigational instrument - Wikipedia

   en.wikipedia.org/wiki/Navigational_instrument

   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. It could be used to find the altitude of the Sun or determine local time. It let sunlight shine through a small orifice on the rim of the instrument.

6. Need to get across the Washington Bridge? This new tool will ...

   www.aol.com/across-washington-bridge-tool-help...

   The big caveat: Since the travel time trends are not posted in real time, unpredictable events − like crashes − can throw off the predictions. The drive times can be viewed at washington ...

7. Navigation - Wikipedia

   en.wikipedia.org/wiki/Navigation

   In the European medieval period, navigation was considered part of the set of seven mechanical arts, none of which were used for long voyages across open ocean. Polynesian navigation is probably the earliest form of open-ocean navigation; it was based on memory and observation recorded on scientific instruments like the Marshall Islands Stick Charts of Ocean Swells.

8. Course (navigation) - Wikipedia

   en.wikipedia.org/wiki/Course_(navigation)

   Instruments used to plot a course on a nautical chart. In navigation, the course of a watercraft or aircraft is the cardinal direction in which the craft is to be steered.The course is to be distinguished from the heading, which is the direction where the watercraft's bow or the aircraft's nose is pointed.

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   Discover the latest breaking news in the U.S. and around the world — politics, weather, entertainment, lifestyle, finance, sports and much more.