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How to Plot a Position How to Plot a Now  that  we  understand  the  latitude  and  longitude  scales,  we  can  learn Position how  to  plot  a  position.  We  can  quickly  and  accurately  plot  any  known position.  Figure  1-14  will  help  illustrate  this  process.  For  example,  a ship’s  position  at  1800  (Lat.  36°  11'N,  Long.  70°  17.5'W)  can  be  plotted as follows: Step 1. 2. 3. 4. 5. 6. Action Find  the  latitude,  36°  11'N,  on  the  latitude  scale. Place  the  point  of  the  compass  on  36°  and  measure  up 11';  now  mark  the  scale  with  the  compass  lead. Without  opening  or  closing  the  compass,  move  the  point of  the  compass  over  to  the  proper  meridian.  In  this  case  it is  70°.  Now  mark  the  meridian  with  the  latitude measurement. Next  we  will  find  our  longitude  70°  and  measure  17.5'. Care  must  be  taken  to  measure  towards  the  west  or  left, towards  the  next  higher  longitude.  Now  we  will  use  our lead  to  mark  off  17.5'. Now  move  the  compass  point  up  to  the  36°  parallel  and mark  off  17.5'.  Continue  to  move  up  the  70th  meridian  to the  point  where  you  marked  off  the  latitude  (36°11'N)  and mark  off  your  longitude.  You  will  now  mark  off  the longitude  once  again,  this  time  making  a  small  arc. Now  place  the  point  of  the  compass  on  the  36°  parallel  at the  point  where  the  70°  17.5'  W  is  marked.  Now  mark  a small  arc  that  will  cross  the  longitude  mark.  That’s  it,  the point  where  the  two  arcs  intersect  is  the  position. How to Extract Latitude and Longitude from a Known Position Figure 1-14. How to plot a position. 1-21

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