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As every schoolboy learns, a point has position but no size, and a line has length but no breadth. Nevertheless, to a navigator concerned with fixing his ship, points and lines are represented on his chart as fine pencil marks.The manner of representing the results of observations as pencil 'points' or 'lines', has undoubtedly led to the belief that a ship's position must be represented as lying at a point on a position line which is drawn on a chart. Nothing short of perfection in positiondoi:10.1017/s0373463300039564 fatcat:5gj6svjayvdanftpbnhoorhug4