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Precision Anchoring, Continued - 14221_392
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Precision Anchoring, Continued - 14221_394
Precision  Anchoring,  Continued Post Anchoring After  the  final  position  of  the  anchor  has  been  determined,  the  navigator Procedure, then  draws  a  second  swing  circle.  This  time  the  navigator  uses  the continued computed  position  of  the  anchor  as  the  center,  and  the  sum  of  the  ship’s length  plus  the  actual  scope  of  chain  let  out  as  the  radius.  If  any previously  undetermined  obstruction,  such  as  a  fishnet  buoy  or  the  swing circle  of  another  ship  anchored  nearby,  is  found  to  lie  within  this  circle, the  ship  may  have  to  weigh  anchor  and  move  away  from  the  hazard.  If the  ship  is  anchored  in  a  designated  anchorage  area,  due  care  should  be taken  to  avoid  fouling  the  area  of  any  adjacent  berths,  even  though  they might  presently  be  unoccupied.  If  the  swing  circle  intersects  another berth,  it  may  be  necessary  to  take  in  some  chain  to  decrease  the  swing radius;  if  this  is  not  possible,  a  move  to  a  larger  berth  may  be  advisable. If  the  navigator  is  satisfied  that  no  danger  lies  within  the  swing  circle, he  or  she  then  draws  the  drag  circle  concentric  with  the  swing  circle, using  as  a  radius  the  sum  of  the  hawsepipe  to  pelorus  distance  plus  the scope  of  chain.  All  fixes  subsequently  obtained  should  fall  within  the drag  circle;  if  they  do  not,  the  anchor  should  be  considered  to  be dragging.  Both  the  swing  circle  and  the  drag  circle  are  shown  in  figure 12-10,  assuming  that  a  scope  of  chain  of  50  fathoms  to  the  hawsepipe has  been  let  out. Figure  12-10.  Swing  and  drag  circles. 12-19

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