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Latitude and Longitude - 14221_34
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How to Determine or Plot Direction on a Chart - 14221_36
How to Measure Distance Background On  Earth’s  surface,  1°  of  latitude  may  be  considered  60  nautical  miles  in Information length;  whereas,  the  length  of  1°  of  longitude  varies  with  latitude. Therefore,  the  latitude  scale  must  be  used  for  measuring  distance. Although  this  scale  is  expanded  on  a  Mercator  chart,  the  expansion exactly equal to the expansion of distance at the same latitude. Therefore,  in  measuring  distance  on  a  Mercator  chart,  one  must  be careful to use the latitude and longitude scale in the area one is measuring.  NEVER  use  the  longitude  scale. is How to Measure Use the table and figure 1-12 to learn how to measure distance on a Distance nautical  chart. Step Action 1. 2. Place one point of the dividers at the beginning of the area to be measured. Open  the  dividers  to  the  desired  distance  to  be  measured. 3. Move  the  dividers  over  to  the  closest  latitude  scale;  do  not open or close the dividers! 4. Place  one  point  of  the  dividers  on  a  whole  degree  of latitude. 5. Place the other point on the latitude scale. 6. Determine  the  distance  between  the  two  points.  (In  figure 1-12,  the  measurement  indicates  10  nmi.) Figure  1-12.  How  to  measure  distance  on  a  chart. 1-19

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