Quantcast Gyrocompass  Error - 14221_77

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Tools Used to Measure Direction - 14221_76
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Quartermaster 3 & 2 - Military manual for the Quartermaster rate
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Bearing  Circle  and  Azimuth  Circle - 14221_78
Gyrocompass  Error Introduction The  gyrocompass  is  normally  the  main  reference  for  direction  for  the surface  navigator.  When  properly  used,  serviced,  and  maintained,  the modern  gyrocompass  is  extremely  accurate.  However,  as  is  the  case with  all  electronic  instruments,  it  is  subject  to  error  and  damage. One  power  failure  or  other  casualty  can  render  the  entire  system  useless. All  naval  ships  are  equipped  with  gyro  failure  alarms.  The  alarms  sound when  a  loss  of  power  is  experienced.  It  is  during  this  time  that  the magnetic  compass  comes  into  play.  As  you  learned  earlier,  the  magnetic compass  does  not  require  electricity  to  operate.  It’s  always  ready  for use  by  the  navigator. Errors Next Most  normally  functioning  gyrocompasses  will  not  have  an  error  of more  than  2.0°  .  More  often  than  not,  the  error  is  between  0.0°  and 0.5°. Rule:  When  at  sea,  the  Quartermaster  must  determine  the  gyrocompass error  at  least  once  a  day.  However,  the  prudent  navigator  will  take advantage  of  every  opportunity  to  check  the  accuracy  of  a  gyro. There  are  many  methods  of  checking  the  accuracy  of  a  gyrocompass. The  following  methods  are  commonly  used  on  U.S.  Navy  ships: Terrestrial  range Trial  and  error  (Franklin  technique) Azimuth  of  the  Sun Amplitude  of  the  Sun The  first  two  methods  are  used  only  when  a  ship  is  near  land.  They  use aids  to  navigation  and  geographic  locations  shown  on  a  chart  for reference.  The  last  two  methods  are  used  when  the  ship  is  at  sea,  and they  use  the  Sun  as  a  reference. Before  we  learn  these  methods,  we  have  to  learn  how  to  use  the  bearing circle,  alidade,  and  PMP.  They  play  a  large  part  in  the  first  two methods.  The  last  two  methods  use  celestial  navigation  methods  to determine  error  and  will  be  discussed  in  length  in  the  Celestial Navigation  chapter. 2-23

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