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Characteristics of Lighted Aids to Navigation - 14221_104
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Visibility of Lights - 14221_106
Characteristics of Lighted Aids to Navigation, Continued Defined Some  aids,  such  as  safe-water  marks  always  use  the  same  rhythm (Morse  "A"),  while  others  may  display  one  of  several  different  rhythms. Figure  4-2  on  the  previous  page  gives  a  description  and  definition  of light  characteristics  (rhythms)  as  well  as  their  chart  symbol abbreviations.  Abbreviations  are  used  on  charts  because  of  space restrictions. When  working  with  composite  light  abbreviations,  you  must  carefully distinguish  between  the  meanings  of  the  numbers  in  parentheses following  a  composite-flashing  light.  In  the  case  of  the composite-flashing  light,  the  numbers  refer  to  the  pattern  of  the  flashes of  light.  On  the  contrary,  when  the  light  is  a  composite-occulting  light, the  numbers  within  the  parentheses  denote  the  pattern  of  the  eclipses  in the light. Light Cycle The  "Light  Cycle,"  or  period  of  a  light,  is  the  time  it  takes  a  light  to complete  one  full  cycle  of  ON  and  OFF  changes.  By  varying  the  length of  the  cycles,  a  clear  distinction  can  be  made  between  numerous  aids  in the  same  area. Numbering and Lettering All  solid  red  and  solid  green  ATONs  are  numbered.  Red  aids  have  even numbers;  green  aids  have  odd  numbers.  The  numbers  for  each  increase from  seaward,  proceeding  in  the  conventional  direction  of  buoyage. Numbers  are  kept  in  approximate  sequence  on  both  sides  of  the  channel by  omitting  numbers  where  necessary. Letters  may  be  used  to  augment  numbers  when  lateral  aids  are  added  to channels  with  previously  completed  numbering  sequences.  If  letters  are used,  they  will  increase  in  alphabetical  order  from  seaward  and  will  be added  to  numbers  as  suffixes. No   other   aids   are   numbered.   Preferred-channel,   safe-water,   isolated danger,  special  marks,  and  information  or  regulatory  aids  may  be lettered,  but  not  numbered. 4-7

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