Cross-bearing

To ascertain the position of a ve el, when near a coast etc. by taking the bearings of two objects marked on the chart, and having the nece ary distance from each other for accurate observation. For instance; a ve el on her pa age from Antwerp to New-York, entering the English channel, finds the Calais light to bear S. E. by E, and that of Cape Grinez S.'/s West; pencil lines being drawn on the chart, one from the Calais light proceeding in the direction N.W. byW. the other from Cape Grinez bearing N. ’/a E; at a certain distance these protracted lines will cro each other, and their point of intersection shows the position of the ship, which by scale is found to be 9 l/s miles from Cape Grinez (French Coast) and an equal distance from the South Foreland (English Coast) thus midway in the mouth of the channel.