Before revision: A position line or line of position (LOP) is a line (or, on the surface of the earth , a curve) that can be both identified on a chart (nautical chart or aeronautical chart) and translated to the surface of the earth .
After revision: A position line or line of position (LOP) is a line (or, on the surface of the Earth , a curve) that can be both identified on a chart (nautical chart or aeronautical chart) and translated to the surface of the Earth .