Quantcast How  to  Determine  Deviation - 14220_65

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Magnetic  Compass  Deviation  Tables - 14220_64
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Quartermaster 1 & C - Military manual for the Quartermaster rate
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The  Shipboard  Degaussing  System - 14220_66
How  to  Determine  Deviation Information As  you  learned  in  the  last  topic,  the  deviation  tables  contain  information on  the  deviation  for  headings.  The  deviation  table  must  be  updated annually  and  posted  on  or  near  the  magnetic  compass.  Follow  the  steps in  the  step  action  table  to  determine  the  deviation  and  magnetic  course to steer. Example:  Refer  to  figure  2-8.  Your  ship  is  on  course  090°  T,  the  gyro fails  and  the  OOD  now  wishes  to  make  good  course  117°  (magnetic course)  by  magnetic  compass.  Find  the  proper  deviation  from  the magnetic  compass  deviation  table  and  recommend  the  correct  magnetic course  to  steer  to  make  117°  good.  In  this  example  we  will  assume  that degaussing  is  turned  OFF. DETERMINING  YOUR  DEVIATION Step Action Example/Result 1. Determine if degaussing is ON or OFF OFF 2. If Then OFF Use  left  column ON Use  right  column In the deviation table, locate the course  nearest  your  desired course. The nearest course is 120 3. 4. Read  the  deviation Deviation equals 3.0 W Apply the deviation correction to RULE:  Westerly  deviation the  ordered  course means that the compass reads less than it should. You must add W deviation to the magnetic course. Easterly  deviation  is  opposite, you must subtract the deviation from the magnetic course to get your course to steer or “compass course.” Magnetic  Course 117° Deviation +  3°  W Compass  Course 120° Because  of  the  compass deviation you must steer compass course 120° to make magnetic course 117° good. 2-11

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