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Assignment 8, Continued - 14221_482
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Assignment 9, Continued - 14221_484
ASSIGNMENT  9 Textbook Assignment: "Dead Reckoning, Piloting, and Electronic Navigation (continued)," and  "Celestial  Observations  and  Sight  Reduction  Methods,"  chapters 8 and 9, pages 8-24 through 9-4. 9-1. What is the principal function of a sextant  in  navigation? 1. To measure ranges to other ships 2. To  measure  the  angle  between  a heavenly  body  and  the  visible horizon 3. To  determine  the  courses  of  the ships 4. To  determine  the  true  bearings of  navigational  aids Figure  9-A 9-8. IN  ANSWERING  QUESTIONS  9-2  THROUGH  9-7 REFER TO FIGURE 9-A, THE MARINE SEXTANT. 9-2. The  index  arm  pivots  about  the exact  center  of  the  curvature  of the part of the sextant marked with what  letter? 1.  B 2.  E 3.  F 4.  G 9-3. What part pivots at one end to allow  the  index  mirror  to  reflect on  the  horizon  glass? 1.  A 2.  D 3.  E 4.  G 9-4. 9-5. 9-6. 9-7. 9-9. 9-10. What part of the sextant is parallel to the horizon glass when the index mark is at zero and there is no index correction? 1.    B 2.    C 3. D 4. F What part of the sextant is the horizon  glass? 1.  A 2.  B 3.  C 4.  E What  part  directs  the  observer's line of sight? 1. B 2.  C 3.  D 4.  E What  part  protects  the  observer's eye when viewing the Sun? 1.  D 2.  E 3.  F 4.  G The  micrometer  drum  of  the  sextant is graduated in which of the following  increments? 1. Half seconds from 0 to 180 2.    Half seconds from 0 to 20 3. Seconds from 0 to 60 4. Minutes from 0 to 60 How many degrees is the sextant index arm moved by one complete rotation  of  the  micrometer  drum? 1. 10 2. 20 3. 50 4. 100 When you take a celestial observation  with  the  sextant,  from what  part  should  the  angular reading be taken? 1. Arc  scale 2. Micrometer drum 3. Vernier  scale 4. Each of the above 55

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