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The  Marine  Sextant,  Continued - 14221_230
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The  Marine  Sextant,  Continued - 14221_232
The Marine Sextant, Continued How to Read Reading  a  sextant  angle  involves  properly  understanding  and  interpreting the Sextant the  markings  on  the  arc  scale,  micrometer  drum,  and  vernier  scale. Follow  these  steps  to  properly  read  a  sextant  angle: Step Action 1. Locate the position of the index arm mark on the arc scale. 2. Determine which degrees the mark is between. The lower reading is the amount of whole degrees. 3. Locate the position of the zero mark on the vernier scale. 4. 5. Determine which minutes the zero mark is between on the micrometer drum. The lower mark is the amount of whole minutes. On the vernier scale, determine which graduation mark is most nearly in line with one of the graduation marks on the micrometer drum. This mark indicates the amount of tenths of a minute. Note: To make sure you select the correct mark, look at the vernier marks on each side of the one that appears to be in line with a drum mark. Both vernier marks will be on the inside of the closest drum marks. Figure  8-14  is  an  example  of  a  sextant  angle  of  67°  40.6'. Figure  8-14.  Reading  a  sextant  angle. 8-27

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