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Assignment 3, Continued - 14220_439
ASSIGNMENT 3 Textbook   Assignment: "Celestial    Observations and   Sight   Reduction   Methods,"   chapter   9,   pages 9-1   through   9-24. 3-1. W h i c h    o f    t h e    f o l l o w i n g    c e l e s t i a l , bodies   is/are   NOT   used   to   determine g y r o    e r r o r ? 1. Sun   only 2. S t a r s 3. Moon   only 4. Polaris   and   Sun 3-2. A   minimum   of   how   many   azimuths   of the   Sun   are   shot   when   figuring gyrocompass    error? 1. 5 2. 2 3. 3 4. 4 3-3. Why   take   multiple   observations   when determining   gyrocompass   error   by azimuth   of   the   Sun? 1. To   make   sure   the   gyro   is working   properly 2. To   use   the   lowest   gyro   error obtained 3. To   use   the   highest   gyro   error obtained 4. The   average   of   all   azimuth observations   obtained   gives   a more   accurate   gyro   error 3-4. What   publication i s    u s e d    t o    f i g u r e t h e    f i r s t    h a l f    o f    a n    a z i m u t h    o f    t h e Sun? 1. Nautical   Almanac 2. Air   Almanac 3. H.O.   Pub   229 4. H.O.   Pub   249 YOUR SHIP IS STEAMING IN THE NORTH ATLANTIC, AND  YOU  FIGURE  GYROCOMPASS ERROR BY AZIMUTH OF THE SUN. THE  DATE IS 18 NOVEMBER 1984, THE DR LATITUDE IS   34°   58'N, AND  LONGITUDE  IS  22°  18'W. THE  ZONE  TIME  IS  14h  42m  19s,  AND  YOU OBSERVE  THE  SUN'S  AZIMUTH  AT  227.8°. IN  ANSWERING  QUESTIONS  3-5  THROUGH  3-19, REFER   TO   FIGURES   9-1,   9-2,   9-3, AND  9-4  IN YOUR TEXT. 3-5. What  is  the  GHA? 1. 48° 42.2' 2. 63° 41.0' 3. 273° 42.2' 4. 288° 42.8' 10 3-6. What   is   the   Total   GHA? 1 .    6 8 °    1 7 . 4 ' 2 .    7 1 °    1 6 . 8 ' 3 .    7 4 °    1 5 . 8 ' 4 .    7 6 °    5 8 . 8 ' 3-7. What   is   the   LHA? 1 .    5 1 °    5 7 . 8 ' 2 .    5 2 °    1 6 . 8 ' 3 .    9 6 °    4 7 . 3 ' 4 .    9 8 °    0 8 . 1 ' 3-8. What   is   the   True   Dec? 3-9. 1. S   19°   21.9' 2. S   19°   22.5' 3. S   19°   21.9' 4. S   19°   23.1' What   is   the   Tab   Z? 3-10. 1. 128.7° 2. 129.0° 3. 129.4° 4. 129.9° What   is   the   (a)   Dec   Inc   and ( b )    Z    d i f f ? 3-11. 1. (a)   -38 (b)   +.7 2. ( a )    . 3 5 3. (a) .38 (b)   +.9 ( b )    - . 7 4. (a) .32 ( b )    - . 8 What   is   the   Dec   Corr? 3-12. 1. +.27 2. - . 2 7 3. +.25 4. -.26 What   are   the   (a)   Lat   Inc   and (b)   Z   diff? 3-13. 1. (a)   .98 (b)   +.2 2. (a)   .97 (b)   +.2 3. (a) .96 4. (a)   .95 (b)   -.2 (b)   -.2 What   is   the   Lat   Corr? 1. +1.5 2. - 1 . 5 3. +1.9 4. - 1 . 9

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