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Types of Lights and Light Structures, Continued - 14220_115
Types of Lights and Light Structures, Continued Ranges One  purpose  of  a  range  is  to  assist  mariners  in  keeping  their  vessels  on the  centerline  of  a  channel.  The  range  may  be  lighted  or  unlighted  and consists  of  two  lights  and  daymarks  located  some  distance  apart  with  the front  display  lower  than  the  rear.  When  the  range  markers  appear  one over  the  other  as  shown  in  figure  4-6,  the  vessel  will  remain  within  the limits  of  the  channel.  Another  purpose  of  a  range  is  to  determine  a ship’s  gyro  error. Figure  4-6.  Using  range  markers. 4-16

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