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Planning and Constructing Great-Circle Tracks, Continued - 14220_379
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Planning and Constructing Restricted Water Tracks - 14220_381
Planning and Constructing Coastal Tracks Considerations There  is  a  great  difference  between  planning  coastal  tracks  and great-circle  tracks.  Coastal  tracks  often  require  more  attention  to dangers  and  shoals.  Normally  coastal  navigation  may  be  defined  as  any ship  operating  within  50  nmi  of  a  coastline.  Often  there  are  many shoals  or  dangers  which  must  be  avoided.  Let’s  look  at  a  real  world example. Ships  departing  Norfolk  for  southern  OPAREAs  often  depart  the  traffic separation  scheme  of  Chesapeake  Bay  and  steer  on  a  SE  heading. Careful  attention  must  be  paid  to  this  route  due  to  shallow  water  and submerged  obstructions  up  to  about  25  nmi  from  the  coast  in  many places.  Also,  hazards  to  navigation  when  turning  south  around  Cape Hatteras  are  too  numerous  to  mention. The  point  of  this  discussion  is  to  make  clear  the  dangers  of  coastal navigation.  The  following  rules  apply  to  coastal  track  construction. Rules: Always  review  all  applicable  coast  pilots  and  sailing  directions before  laying  down  tracks Check  the  proposed  track  thoroughly  for  dangers.  Never  allow  the track  to  pass  within  5  nmi  of  any  danger. Highlight  all  coastal  aids  to  navigation Highlight  any  shoals,  towers,  OADS  buoys,  or  other  obstructions. Use  the  best  scale  of  chart  available  for  any  area  the  ship  transits. Use  the  following  table  to  construct  coastal  tracks: Step Action 1. Choose  points  from  a  small  scale  mercator  chart  that  covers  the entire  area  the  ship  will  transit.  Draw  lines  for  tracks  and  label. 2. Transfer  track  to  the  best  scale  coastal  charts  available. 3. Check  each  leg  of  the  transit  for  dangers. 4. Determine  SOA  and  label  each  chart  with  PIM. 5. Apply  all  rules  making  sure  to  highlight  shoal  water,  dangers, and  NAVAIDs. 12-6

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