Marina Exam for OIC: There are seven sources of errors in a marine sextant . Of the four errors listed, which one is adjustable?

Marina Exam for OIC: 

There are seven sources of errors in a marine sextant . Of the four errors listed, which one is adjustable? 

A.Prismatic Error 
B.Graduation Error 
C.Centering Error 
D.Error of Collimation 



Answer:  D. Error of Collimation