FACTOID # 148: The top ten tourist destinations France, Spain, USA, Italy, China, UK, Austria, Mexico, Germany and Canada account for 49.6 percent of all tourist arrivals worldwide.
 
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Encyclopedia > Line of position

A position line is a line that can be identified both on a nautical chart or aeronautical chart and by observation out on the surface of the earth. The intersection of two position lines is a fix that used in position fixing to identify the navigator's location. Portion of chart of Bering Strait, site of former land bridge between Asia and North America. ... An aeronautical chart is a map designed to assist in navigation of aircraft, much as nautical charts do for watercraft, or a roadmap for drivers. ... Earth (IPA: , often referred to as the Earth, Terra, the World or Planet Earth) is the third planet in the solar system in terms of distance from the Sun, and the fifth largest. ... A position fix or simply a fix is a term used in position fixing in navigation to describe a position derived from measuring external reference points. ... Position fixing is the branch of navigation concerned with the use of a variety of visual and electronic methods to determine the position of a ship, aircraft or person on the surface of the Earth. ...


There are several types of position line:

  • Compass bearing - the angle between north and the line passing through the compass and the point of interest
  • Transit - a line passing through the observer and two other reference points
  • Leading line - the line passing through two marks indicating a safe channel
  • Leading lights - the line passing through two beacons indicating a safe channel
  • Sector lights – the lines created by masked coloured lights that indicate a safe channel

  Results from FactBites:
 
Fix (position) - Wikipedia, the free encyclopedia (231 words)
A position fix or simply a fix is a term used in position fixing in navigation to describe a position derived from measuring external reference points.
The term is generally used only with manual or visual techniques such as the use of intersecting visual or radio position lines rather than the use of more automated and accurate electronic methods such as GPS.
If three position lines can be obtained, the resulting "cocked hat" gives the navigator an indication of the accuracy in the three separate position lines.
  More results at FactBites »


 

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