Great circle sailing .

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a great circle track is the shortest distance , measured along the earth's surface , btween 2 poles. a great circle track cuts successive meridians at different angles b'coz meridians are nt parallel to each oder . the course, therefore, shud change slightly whilst crossing each meridia.practically at sea, the departure and arrival positions are plotted on a gnomonic chart  and joined by a straight line . the vertex and suitable points are read off the chart and the navigator does mercator sailing from point to point thereby following the great circle track effectively ..!!

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• Great Circle sailing