1. You observe the lower limb of the Sun at a sextant altitude (hs) of 46° 20.3' on 1 April 1981. The index error is 4.5' off the arc. The height of eye is 57 feet. What is the observed altitude (Ho)?
A. 46° 24.2'
B. 46° 27.9'
C. 46° 30.1'
D. 46° 32.6'
2. You are keeping ZD +4 on your vessel. On 21 June 1981, at 0906 DST, loran fixes your position at Lat. 30° 48.0' N, Long. 71° 00.0' W. You are on a course of 167° T at 15.2 knots. At what time will local apparent noon (LAN) occur at your vessel?
A. 1145
B. 1202
C. 1218
D. 1245
3. On 27 March 1981, your 0330 zone time DR position is Lat. 23° 32' N, Long. 154° 47' E. Your vessel is on a course of 105° T at a speed of 20 knots. What will be the zone time of sunrise at your vessel?
A. 0534
B. 0557
C. 0612
D. 0624
4. On 28 February 1981, your 1850 zone time DR position is Lat. 27° 49.0' N, Long. 159° 24.0' W. Considering their magnitude, azimuth, and altitude, which group includes the three stars best suited for a fix at star time?
A. Rigel, Schedar, Regulus
B. Sirius, Mirfak, Elnath
C. Hamal, Alkaid, Canopus
D. Bellatrix, Vega, Regulus
5. On 14 January 1981, your 1922 ZT DR position is Lat. 27° 18.5' S, Long. 67° 18.0' E. You observe an unidentified star bearing 029° T, at an observed altitude (Ho) of 29° 35.0'. The chronometer reads 03h 25m 43s and is 03m 15s fast. What star did you observe?
A. Elnath
B. Fomalhaut
C. Pollux
D. Markab
6. On 5 May 1981, at 1953 zone time, you take a sextant observation of Polaris. Your vessel's DR position is Lat. 29° 30.0' N, Long. 66° 25.7' W, and your sextant reads 29° 07.2'. Your chronometer reads 11h 51m 45s, and your chronometer error is 01m 36s slow. Your height of eye is 56 feet, and the index error for your sextant is 1.5' on the arc. What is the latitude of your vessel from your observation of Polaris?
A. 29° 14.3' N
B. 29° 23.6' N
C. 29° 32.3' N
D. 29° 38.8' N
7. On 8 December 1981, in DR position Lat. 21°56.1' S, Long. 17°21.6' E you observe an amplitude of the Sun. The Sun's center is on the celestial horizon and bears 240.5° psc. The chronometer reads 05h 27m 21s and is 00m 47s fast. Variation in the area is 3.3° E. What is the deviation of the standard magnetic compass?
A. 1.5° W
B. 0.3° W
C. 0.6° E
D. 1.5° E
8. On 1 September 1981, your 1115 zone time DR position is Lat 25° 20.0' N, Long. 28° 24.0' W. At that time, you observe the Sun bearing 160.5° psc. The chronometer reads 01h 14m 58s, and the chronometer error is 01 m 17s fast. The variation is 13.5° W. What is the deviation of the standard compass?
A. 2.1° E
B. 4.1° E
C. 11.0° W
D. 11.0° E
9. On 4 July 1981, at 0630 ZT, morning stars were observed, and the vessel's position was determined to be Lat. 21° 15.0' S, Long. 20° 20.0' W. Your vessel is steaming at 13.0 knots on a course of 146° T. A sextant observation of the Sun's lower limb is made at 0915 ZT. The chronometer reads 10h 14m 27s, and the sextant altitude is 25° 29.8'. The index error is 3.1' off the arc, and the chronometer error is 0m 53s slow. Your height of eye on the bridge is 48.0 feet. What is the azimuth (Zn) of this sight using the assumed position?
A. 049.5° T
B. 052.6° T
C. 054.3° T
D. 058.9° T
10. On 28 July 1981, your 0800 zone time fix gives you a position of Lat. 25° 16.0' N, Long. 71° 19.0' W. Your vessel is on course 026° T, and your speed is 17.5 knots. Local apparent noon (LAN) occurs at 1149 zone time, at which time a meridian altitude of the Sun's lower limb is observed. The observed altitude (Ho) for this sight is 82° 28.7'. What is the calculated latitude at LAN?
A. 26° 21.9' N
B. 26° 23.4' N
C. 26° 25.0' N
D. 26° 27.7' N
11. On 4 May 1981, your 0500 zone time position was Lat. 24° 45.0' N, Long. 120° 18.0' W. Your vessel was steaming on course 315° T at a speed of 15.5 knots. An observation of the Sun's upper limb was made at 0830 ZT. The chronometer read 04h 31m 32s and was fast 01m 24s. The observed altitude (Ho) was 40° 11.8'. LAN occurred at 1204 zone time. The observed altitude (Ho) was 80° 05.0'. What was the longitude of your 1300 zone time running fix?
A. Long. 121° 59.2' W
B. Long. 121° 57.4' W
C. Long. 121° 53.5' W
D. Long. 121° 49.8' W
12. On November 22, 1981, at 1134 ZT, you observe the lower limb of the Moon with a sextant altitude (Hs) of 42° 10.6'. Your DR position is Lat. 28° 25.0'S, Long. 42° 40.0'W. The chronometer reading at the time of sight is 2h 33m 46s and the chronometer is 15s slow. The height of eye is 39 feet and the index error is 1.5' on the arc. Determine the altitude intercept (a), and azimuth (Zn) of this sight?
A. a - 43.1 miles towards, Zn 062.7° T
B. a - 43.1 miles away, Zn 297.3° T
C. a - 29.1 miles towards, Zn 297.3° T
D. a - 29.1 miles away, Zn 297.3° T
13. On 9 March 1981, your 1700 ZT DR position is Lat. 22° 17.0' S, Long. 168° 12.0 E. You are on course 343° T, and your speed is 14.9 knots. What will be the zone time of moonset?
A. 2012
B. 2024
C. 2036
D. 2110
