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Determining  Gyro  Error  by  Terrestial  Range - 14220_86
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Determining Gyro Error by Trial and Error Franklin Technique The  Franklin  technique  is  extremely  useful  just  prior  to  getting  a  ship under  way.  The  Franklin  technique  provides  an  alternative  and  must  be used  if  the  gyro  error  cannot  be  checked  by  another  method  prior  to getting  under  way.  To  determine  gyro  error  using  the  Franklin technique  follow  the  steps  in  the  table  and  refer  to  figure  2-22. Step 1. 2. Action Select  three  to  five  navaids  from  the  chart.  For  the  best  results, the  selected  navaids  should  be  about  120”  apart.  (The  ship  must be  pierside  or  anchored,  large  towers  and  conspicous  buildings may  be  selected). Compare  the  repeater(s)  to  be  used  against  the  master  gyro;  note errors. Take  a  round  of  bearings  on  the  selected  navaids,  and  apply  any repeater  error  to  the  bearing. Example:  The  repeater  reads  187°  and  the  master  gyro  reads 3 . 187.5°.  The  repeater  is  reading  ½°  less  than  (compass  least  error east).  Since  the  error  is  0.5°  east  (less  than),  0.5  must  be  added  to all  bearings  taken  from  that  repeater. Plot  the  corrected  bearings  on  the  chart  with  the  PMP  set  for  0° 4. gyro error. Observe  how  the  lines  intersect,  if  they  meet  in  a  point  the  gyro  is “ON”  and  has  no  error.  If  the  lines  do  not  intersect,  subtract  or 5. add  1.0°  at  a  time  until  the  triangle  closes.  The  amount  of correction  is  the  total  gyro  error.  Log  it  in  the  deck  log  and Magnetic  Compass  Record  Book. Figure  2-22.  Determing  gyro  error  by  adjusting  bearings. 2-33

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