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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 is 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 ==See also== * Navigation * Position circle 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Position line」の詳細全文を読む スポンサード リンク
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