Position line


Position line

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.

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

ee also

* Navigation


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Look at other dictionaries:

  • position line — A line indicating a series of positions at which the observer is estimated to be at the time of observation. These can be straight, curved, hemispherical, or irregular lines, depending on the information they convey. Circular position lines… …   Aviation dictionary

  • position line — noun : line of position * * * Navig. See line of position. [1860 65] …   Useful english dictionary

  • position line — Navig. See line of position. [1860 65] * * * …   Universalium

  • hyperbolic position line — Position lines obtained from NAVAIDs (navigational aids) such as CONSOL, LORAN (long range navigation), and DECCA are hyperbolic in shape. These normally are combined with another position line of the same type to obtain a fix. These normally are …   Aviation dictionary

  • astronomical position line — A position line obtained by sighting a planetary body. From the geographical position, an arc is drawn which is equal to the zenith distance of the body. A tangent to this arc is the astro position line. To obtain a fix, either another astro, or… …   Aviation dictionary

  • transferred position line — A position line redrawn to a slightly later time. It is parallel to the original but is displaced by calculated ground distance. Also called a running fix …   Aviation dictionary

  • pressure-pattern position line — A line of position, determined by pressure pattern formulas, plotted parallel to the effective heading of the aircraft and indicating the net cross heading displacement. Also called the line of position pressure or the pressure line of position… …   Aviation dictionary

  • radar-range position line — The circular position lines that obtain the range data of the ground beacon in an aircraft by equipment employing the transmitter or responder techniques, such as TACAN (tactical air navigation), Rebecca, or Eureka …   Aviation dictionary

  • transit position line — A great circle projected through two known points and the observer …   Aviation dictionary

  • 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.These techniques include:* Position lines and position circles *… …   Wikipedia


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