# Dictionary:Line of position (LOP)

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{{#category_index:L|line of position (LOP)}}
The locus of equal values measured with a positioning system, such as a line of equal phase difference with Raydist or Omega. Lines that represent constant range from a reference location are circles (Figure L-6); lines that represent constant difference in ranges are hyperbolas; lines that represent the constant sum of ranges are ellipses. The intersection of two lines of position determines a location **fix**. Positions may be determined by the intersection of two families of circles, by two families of hyperbolas, by a combination of circles and hyperbolas, etc.