position line

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A line plotted on the chart, whether from a terrestrial bearing, a sextant altitude, or a hyperbolic system, somewhere along which the ship must lie. In celestial navigation and in conventional chartwork the position line is usually indicated by a single arrowhead at each end, to distinguish it from other lines on the chart or plotting sheet.

See also sumner's position line.

See also sumner's position line.

Subjects: Maritime History.

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