CHIEF MATE EXAM ORAL QUESTIONS AND ANSWERS - LATEST QUESTIONS | Page 152

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INDEX ERROR
ERROR OF PERPENDICULARITY
COLLIMINATION ERROR
SIDE ERROR

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in addition there are some non-adjustable erroes
 graduation error,shade error,optical error, prismatic error,telescopic error

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Sextant Errors are of 2 Types:
1) Adjustable error,
2) Non Adjustable errors
1)Adjustable errors:
  a)error of perpendicularity,
  b)Index error,
  c)Side error,
  d)Error of collimination
2)Non adjustable Errors:
  a)Graduation Error,
  b)Shade Error,
  c)Optical Error,
  d)convex Error..