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Page Title: Determining the Ship’s Position Using Sextant Angles
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The  Marine  Sextant,  Continued - 14220_236
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Quartermaster 1 & C - Military manual for the Quartermaster rate
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Determining the Ship’s Position Using Sextant Angles, Continued - 14220_238
Determining the Ship’s Position Using Sextant Angles Accuracy and Usage Horizontal  sextant  angles  give  fixes  of  great  accuracy  that  are  not affected  by  any  error  of  the  compass.  A  fix  by  horizontal  sextant  angles is  labeled  the  same  as  a  visual  fix  with  a  small  circle  around  the  position and  the  time  of  the  fix  close  to  the  fix  symbol. Horizontal  sextant  angles  used  in  conjunction  with  a  computer-assisted positioning  program  are  the  most  common  method  used  by  the  Coast Guard  to  position  aids  to  navigation. Horizontal  sextant  angles  should  be  taken  as  nearly  simultaneously  as possible,  preferably  by  two  people  on  a  predetermined  signal.  However, one  person  can  obtain  both  angles  if  the  ship  is  not  moving  quickly. Procedure Rule:    To  obtain  a  fix  using  sextant  angles,  you  must  have  three  fixed visual  objects,  and  those  objects  must  be  identifiable  on  the  chart. Follow  these  steps  to  obtain  horizontal  sextant  angles: Step Action 1. Hold  the  sextant  horizontally  with  your  right  hand. 2. View  the  left  object  directly  through  the  telescope. 3. Release  the  index  arm  with  your  left  hand  on  the  release levers  and  swing  the  arm  so  that  the  index  mirror  reflects  the center  object  in  the  horizon  glass  below  the  left  object. 4. Rotate  the  micrometer  drum  to  fine  adjust  the  reflected object  in  line  with  the  object  viewed  directly. 5. Take  a  reading  of  the  angle. 6. Do  you  have  two  people  taking  angles? If  yes,  both  angles  are  ready  to  be  plotted. If  no,  repeat  steps  1  through  5  using  the  center  object  viewed directly  and  the  right  object  viewed  reflected. 8-33

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