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Sector Lights, Continued - 14220_120
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Buoys,  Continued - 14220_122
Buoys Buoys Buoys  are,  in  effect,  floating  sign  posts  for  the  mariner.  Their  color, shape,  number,  light,  or  sound  characteristic  tell  the  mariner  how  to transit  safe  water  and  avoid  navigational  hazards,  and  assist  the  mariner in  following  the  proper  course. Buoy  symbols  shown  on  charts  (see fig.  4-10)  indicate  the  approximate  position of  the  buoy  and  of  the  sinker  that  moors the  buoy  to  the  bottom.  The  approximate position  is  used  because  it  is  difficult  to keep  a  buoy  and  its  moorings  in  an  exact geographical   location.   These   difficulties include,  but  are  not  limited  to,  imprecise Figure  4-10.  Buoy  symbol methods  of  position  fixing,  existing  atmospheric  and  sea  conditions,  and variations  in  the  seabed’s  slope  and  makeup.  The  position  of  the  buoy can  be  expected  to  shift  inside  and  outside  the  area  shown  on  the  chart because  they  are  moored  with  excess  chain.  In  addition,  buoys  and sinkers  are  normally  checked  only  during  periodic  maintenance  visits, which  often  occur  more  than  a  year  apart. Types of Buoys There  are  many  different  types  of  buoys  in  our  buoyage  system,  with each  type  designed  to  meet  certain  requirements.  All  buoys  assist mariners  during  daylight  hours,  and  those  with  light,  sound  signals,  or both,  serve  the  mariner  during  darkness  or  periods  of  low  visibility.  The following  are  the  principal  types  of  buoys  you  will  encounter: Spar  buoys  are  cylindrical  in  shape  and  are  often  constructed  from  large logs,  which  are  trimmed,  shaped,  and  appropriately  painted.  Some  are metal,  plastic,  or  fiberglass. Can  buoys  (fig.  4-11)  are  built  such  that  the  upper  portion  that  you observe  resembles  a  can.  These  buoys  are  unlighted  and  will  be  painted green  or  have  green  and  red  horizontal  bands. Nun  buoys  (fig.  4-11)  are  built  such  that  the  upper  portion  you  observe resembles  a  cone  with  a  rounded  tip.  Like  cans,  these  are  also  unlighted and  will  be  painted  red  or  have  red  and  green  horizontal  bands. Spherical  buoys  are  unlighted  and  are  round  in  shape.  These  buoys  are painted  with  red  and  white  vertical  stripes. 4-23

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