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Page Title: Planning and Constructing Great-Circle Tracks, Continued
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Planning and Constructing Great-Circle Tracks, Continued - 14221_378
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Planning and Constructing Coastal Tracks - 14221_380
Planning and Constructing Great-Circle Tracks, Continued PIM At  this  point  in  track  construction,  we  have  done  everything  except determine  PIM.  Use  the  following  step  action  table  to  determine  PIM and  label  the  track.  As  an  example,  we  will  assume  that  the  ship  departs at  10SEP1200Z  and  arrives  at  the  straits  of  Gibraltar  on  19SEP0700Z. Step Action 1. Find  the  total  hours  available  for  the  transit. 19 0700 = 18 3100 10 1200 10 1200 8  1900  =  8  days  x  24h  +  19h  or  211  hours 2. Add  together  all  rhumb  line  distances  between  points  A through  H.  For  our  example,  we’ll  assume  this  to  be 2247.5  nmi. 3. Determine  the  overall  SOA.  2247.5  nmi  ÷  211 hours=l0.65kn.  Always  round  up  to  the  nearest  l/10  of  a knot.  SOA  =  10.7 4. Begin  with  the  departure  point  and  lay  out  PIM  times  and  date in  GMT  for  every  4  hours  of  transit  time.  Also  label  the  time of  departure  from  each  individual  point.  At  this  point  we have  completed  our  track  construction.  As  an  aid  to  tracking the  ship’s  progress  it  is  highly  recommended  that  the  track also  be  transferred  to  a  small  scale  chart,  as  shown  in  figure 12-3. Figure  12-3.  Segment  of  overall  track. 12-5

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