OXFORD NAVIGATION DIRECTION LAT & LONGITUDE GREAT CIRCLES, RHUMB LINES and DIRECTIONS EARTH MAGNETISM WIND AND WIND COMPONENTS THE 1 IN 60 RULE NAVIGATION USING THE 1 IN 60 RULE APPLICATIONS OF THE 1 IN 60 RULE TOPOGRAPHICAL MAPS AND MAP READING CONVERGENCY AND CONVERSION ANGLE DEPARTURE SCALE MERCATOR MERCATOR CHART SCALE MERCATOR CHARTS – PLOTTING REVISION QUESTION 1