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Current Calculations, Continued - 14220_202
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Quartermaster 1 & C - Military manual for the Quartermaster rate
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Chapter 8 Dead Reckoning, Piloting, and Electronic Navigation - 14220_205
How to Graph Tidal Currents Procedure The  graphing  of  current  velocity  information  is  generally  the  same  as graphing  tide  data.  The  most  important  difference  is  that  tide  height changes  at  a  fairly  constant  rate.  Current  velocity  on  the  other  hand  is related  to  many  factors;  for  complete  information  on  current  velocity, refer  to  Duttons,  chapter  10. We  can  use  the  times  between  slack  water  and  maximum  current  to  plot our  data.  Table  4  can  help  us  determine  the  amount  of  time  a  current  is weak  and  it  should  also  help  us  make  an  educated  guess  of  how  steep  a curve  must  be  plotted. You  may  want  to  overlay  the  current  data  on  the  same  graph  as  the  one that  has  tide  data  for  the  same  period.  If  this  is  the  case,  it  is  normally acceptable  to  omit  drawing  curves  for  the  current  data.  Instead,  you would  draw  straight  lines  between  slack  water  and  maximum  current. At  the  intersection  of  each  line,  annotate  SW  for  slack  water  and  MC  for maximum  current  respectively.  If  you  do  choose  to  overlay,  make  sure you  use  different  colors  of  ink,  one  that  represents  tide  data  and  one  that represents  current  data. What’s Next In  our  next  chapter  you’ll  learn  how  the  Quartermaster  keeps  track  of the  ship’s  position. 7-23

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