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How to Plot a Position - 14220_37
How to Determine or Plot Direction on a Chart Background Information Remember,  meridians  on  a  Mercator  chart  appear  as  straight  lines, parallel  to  and  equidistant  from  one  another.  You  know  they  represent imaginary  curved  lines,  not  parallel  to  one  another  at  all,  but  converging at  the  poles.  Appearance  of  meridians  on  a  Mercator  projection  as parallel  straight  lines  is  one  of  the  most  valuable  features  of  this  type  of projection,  making  it  possible  to  plot  a  course  as  a  straight  line  (a  rhumb line).  On  a  Mercator  projection,  a  rhumb  line  cuts  every  meridian  at  the same  angle.  In  other  words,  it  is  a  line  of  the  same  bearing  throughout. Although  it  does  not  represent  the  shortest  distance  between  the  points  it connects,  this  fact  is  not  important  unless  very  large  distances  are involved.  Use  the  table  and  figure  1-13  to  determine  or  plot  direction. Step Action 1. Identify the two points that you want to determine the direction to or from. Example: Pt A and Pt B. Lay one edge of the parallel rulers so that it passes through each 2. point. 3. Firmly press down on one side of the parallel rulers and begin to move the ruler to the compass rose. 4. Position the ruler so either edge passes through the center crosshair of the compass rose. 5. Use a pencil to mark the outside ring of the compass rose 6. Read the bearing on the outside ring of the compass rose. Figure  1-13.  Plotting  a  position  on  a  chart. l-20

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