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Page Title: Tools Used to Measure Direction
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Tools Used to Measure Direction Introduction The  QM  uses  several  pieces  of  navigational  equipment  to  determine direction.  Remember  that  direction  may  be  labeled  in  many  ways,  such as  course,  azimuth  angle,  bearing...  .  The  following  table  contains information about tools and their uses. Tool Most  often  used... to obtain the bearings of other ships to determine  relative  motion Bearing  Circle also  to  find  the  bearing  of any object. Azimuth  Circle to obtain an azimuth of the Sun for checking gyrocompass   error also as a bearing circle. to obtain bearings of aids to navigation to determine  the  ship’s  position Telescopic  Alidade also to obtain data for 1amplitudes for checking  gyrocompass  error. to  determine  and  plot  bearings  and  courses  on charts Parallel  Motion Protractor  (PMP) 1 Obtaining  an  amplitude  is  a  method  of  checking  the  error  of  the  gyrocompass.  An amplitude is normally taken of the Sun rising or falling, but it may be used for any celestial body. 2-22

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