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How  to  Set  Up  the  PMP - 14220_81
Parallel  Motion  Protractor  (PMP) Introduction The  PMP  is  a  valuable  tool  for  plotting  direction  quickly  and  accurately. When  in  restricted  waters  and  plotting  fixes  every  3  minutes,  you  will greatly  appreciate  this  instrument.  The  PMP  is  usually  anchored  to  the top  of  the  chart  table. The  PMP  is  designed  to  keep  the  moveable  compass  rose  oriented  to  the longitude  and  latitude  of  any  chart.  An  arm  is  attached  to  the  moveable compass  rose  which  can  be  rotated  to  whatever  bearing  you  require  and then  moved  to  the  object  on  the  chart  that  the  bearing  was  taken  to,  so an  LOP  can  be  drawn. Part Description   of   function Anchor plate Allows the PMP to be attached to the chart table. Friction control knob Allows adjustment of movement of the arms at the two linkage points. Bearing scale A 360° circle marked in 1° increments. When locked it will maintain its orientation when moved around the chart table. Index  marks Used to align the ruler on the desired bearing. The four marks spaced every 90° are inscribed on a plate that is directly linked to the handle and the ruler. Protractor lock switch Locks the bearing scale when aligning the PMP. Scale lock switch Locks the PMP ruler on a desired bearing. Figure  2-15.  Parts  of  a  PMP. 2-26

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