Quantcast Determining  Gyro  Error  by  Terrestial  Range - 14220_86

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How  to  Use  the  Telescopic  Alidade - 14220_85
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Quartermaster 1 & C - Military manual for the Quartermaster rate
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Determining Gyro Error by Trial and Error - 14220_87
Determining  Gyro  Error  by  Terrestial  Range Background An  excellent  opportunity  to  check  the  accuracy  of  the  gyrocompass presents  itself  each  time  a  ship  enters  or  departs  port.  Most  harbors  will have  at  least  one  set  of  range  markers  set.  This  method  of  checking  a gyrocompass  is  often  referred  to  as  obtaining  a  range  of  opportunity. To  determine  gyro  error  by  terrestial  range,  you  should  follow  the  steps in  the  table  and  refer  to  figure  2-21. Step Action 1. View  the  range  markers  through  the  alidade. 2. The  ship  maneuvers  "on  range"  (range  markers  are  in line.) 3. "Shoot"  (take)  a  bearing  on  the  range  markers  while they  are  lined  up. Compare  the  bearing  taken  against  the  chart. 4. Figure  2-21.  Determining  gyro  error  by terrestial  range. Tip It  is  also  possible  to  mark  a  range  as  it  passes  down  the  port  or starboard  side  of  the  ship.  The  steps  in  the  action  table  are  still  basically the  same;  the  exception  is  that  the  ship  will  not  maneuver  on  range. The  bearing  taker  must  shoot  the  bearing  to  the  range  markers  the instant  that  they  are  in  line.  This  method  is  only  as  accurate  as  the experience  and  ability  of  the  bearing  taker. 2-32

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