Navigation in Theory and Practice

40 miles bearing Cape Clear Cape Cornwall circle track co-mid-latitude compass course cosec cosine cotan course and distance degree of longitude difference of latitude difference of longitude Dist distance run draw drawn earth east equator find difference find the compass find the course find the difference find the distance find the latitude find the true formulæ inch knot last courses latitude 50 latitude and longitude length log line logarithm longi magnetic Mercator's chart Mercator's Sailing meridian meridian distance method mid-lat mid-latitude middle latitude sailing N.W.byN nautical miles Navigation noon observed parallel of latitude Parallel Sailing plane sailing pole port tack position represent Required the compass rhumb line right angles sails from latitude secant ship sails ship's head side subtract Suppose table previously given traverse table true course true distance tude variation vertex wind