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Weather Observation and Reporting, Continued - 14221_330
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Chapter 11 The Ship’s Bridge - 14221_333
Weather Observation and Reporting, Continued CNOC  3140/8 Part II Additional Reporting Requirements Additional Information Column Number (A) (B) (C) (D) (E) (F) Column Name Position Course Speed Seawater Temperature Sea Waves, Period,  and Height Swell Waves, Direction, Period,  and Height Explanation Abbreviated  ship’s  position. General  direction  of  the  ship’s  course. Ship’s speed. Seawater  temperature  reported  to  the  nearest  0.1 Fahrenheit. The  duration  in  seconds  from  the  crest  of  one wave  to  the  next  and  the  average  wave  height. Sea  waves  are  caused  by  local  wind  conditions. The  direction,  duration  in  seconds  from  the  crest of  one  wave  to  the  next,  and  the  average  wave height. Part  II  is  designed  to  allow  transmission  via  radio  message  of  encoded weather  information.  The  step-by-step  instructions  are  printed  in  the Manual  for  Surface  Ship’s  Weather  Observations  and  will  not  be reproduced  here.  This  manual  should  be  consulted  each  time  an  OBS is made. Ship’s  are  required  to  submit  encoded  weather  every  6  hours  of  GMT. For  example  a  message  should  be  sent  at  0000,  0600,  1200,  and  so  on. If  winds  are  greater  than  33  knots,  then  messages  must  be  sent  with  an immediate  precedence  every  3  hours. As  you  may  have  guessed,  weather,  like  navigation,  is  a  complex  subject on  which  volumes  have  been  written.  The  objectives  of  this  chapter  are to  prepare  you  to  report  the  weather;  however,  senior  QMs  should thoroughly  acquaint  themselves  with  all  aspects  of  weather.  The  AG series  of  TRAMANs  is  an  excellent  place  to  begin.  Also  Pub  No.  9, Bowditch,  has  comprehensive  information  about  weather  and  the mariner. 10-35

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