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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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