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Factors Associated with Navigational Lights - 14220_117
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Sector Lights, Continued - 14220_119
Sector Lights Information Sectors  of  colored  glass  are  placed  in  the  lanterns  of  certain  lighthouses to  indicate  danger  bearings  within  which  a  ship  will  be  in  danger  of running  on  rocks,  shoals,  or  some  other  hazard.  The  arcs  over  which  a red  light  shows  are  the  danger  sectors  whose  bearings  usually  appear  on the  chart.  Although  the  light  is  red  within  the  danger  arc,  its characteristics  remain  the  same.  It  should  be  noted,  however,  that  the red  light  within  the  red  sector  may  not  be  as  visible  as  the  white  light outside  that  sector. Sectors  may  be  only  a  few  degrees  in  width,  marking  an  isolated obstruction,  or  they  may  be  so  wide  that  they  extend  from  the  direction of  deep  water  to  the  beach. In  most  instances,  red  sectors  indicate  water  areas  to  be  avoided.  A narrow  green  sector  may  signify  a  turning  point  or  the  best  water  across a  shoal.  Exact  significance  of  each  sector  may  be  obtained  from  the chart. Exercise  caution  so  that  the  danger  sectors  are  not  mistaken  for  the sectors  of  good  water  or  that  incorrect  bearings  are  taken  from  the  chart. All  sector  bearings  are  true  bearings  in  degrees  running  clockwise around  the  light  as  a  center  and  are  expressed  as  BEARINGS OBSERVED  FROM  THE  SHIP  TOWARDS  THE  LIGHT. Take  a  look  at  the  example  presented  in  figure  4-9.  The  Light  List Remarks  column  shows  Cape  Henry  Light  (LLNR  365)  as  having  a  red sector  from  154°  to  233°.  As  long  as  your  ship  is  within  this  sector,  the light  will  appear  red.  In  this  same  example  you  will  also  note  that  the nominal  range  of  the  red  light  is  15  miles,  while  the  same  light  in  the white  sector  has  a  nominal  range  of  17  miles.  The  reason  for  this difference  is  that  a  white  light  of  a  certain  intensity  is  visible  for  a longer  distance  than  a  red  light  of  the  same  intensity. 4-20

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