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The  Shipboard  Degaussing  System,  Continued - 14221_67
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Compass Error Calculations Background In  navigational  work,  you  have  to  develop  the  ability  to  quickly  and accurately  convert  directions  between  true,  magnetic,  and  compass (headings,  courses,  and  bearings). A  heading  or  course  is  the  same  as  an  angle.  It  is  the  angle  that  the centerline  of  the  ship  or  boat,  or  a  line  marked  on  a  chart  makes  with some  other  reference  line. Reference Three  lines  of  reference  have  been  established:  the  direction  of  true north,  or  the  true  meridian;  the  direction  of  magnetic  meridian;  and  the direction  of  the  north  point  of  the  compass.  Ship’s  heading  is  the  same. How  you  describe  it  depends  on  the  reference  point  used. There  are  three  ways  to name  a  course  or heading: True   heading Magnetic   heading Compass   heading Comment Whether  you  are  determining  courses  the  helmsman  is  to  steer,  obtaining bearings  to  be  plotted  on  a  chart,  laying  track  lines  on  the  chart,  or recording  courses  in  the  Magnetic  Compass  Record  Book,  knowing  how to  apply  variation  and  deviation  comes  into  play.  The  big  question  is "how  do  we  convert  one  to  the  other?"  Practice  is  needed  to  perform this  task.  However,  keep  in  mind  that  you  first  need  to  reason  each step,  until  later  when  the  process  becomes  habit. 2-14

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