National Maritime Center

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1 National Maritime Center Providing Credentials to Mariners (Sample Examination) Page 1 of 5

2 Choose the best answer to the following Multiple Choice questions. 1. On 24 July your 1912 zone time DR position is LAT ' N, LONG ' W. Considering their magnitude, azimuth, and altitude, which group includes the three stars best suited for a fix at star time? o (A) Arcturus, Acrux, Hadar o (B) Vega, Deneb, Regulus (C) Spica, Altair, Alioth o (D) Fomalhaut, Rigel, Pollux If choice C is selected set score to At 0520 zone time on 17 March, while taking stars for a morning fix, you observe an unidentified star bearing 050 T, at an observed altitude (Ho) of '. Your DR position at the time of the sight is LAT 'N, LONG ' W. The chronometer time of the sight is 08h 22m 15s, and the chronometer error is 01m 45s fast. Your vessel is steaming on a course of 300 T at a speed of 18 knots. What star did you observe? o (A) Altair (B) Deneb o (C) Alkaid o (D) Arcturus 3. You are underway on course 315 T at 14 knots. The current is 135 T at 1.9 knots. What is the speed being made good? (A) 12.1 knots o (B) 13.5 knots o (C) 14.0 knots o (D) 15.9 knots 4. On 7 December your 0350 ZT position is LAT 35 42'N, LONG 17 38'E. You observe Polaris bearing pgc. At the time of the observation the helmsman noted that he was heading 016 pgc and 014 psc. The variation is 1 E. What is the deviation for that heading? (A) 0.3 E o (B) 1.5 E o (C) 0.3 W o (D) 1.5 W Page 2 of 5

3 5. On 27 March your 0730 zone time position is LAT 28 16'N, LONG 56 37'W. Your vessel is on course 158 T at a speed of 15.0 knots. An observation of the Sun's lower limb is made at 0915 zone time. The chronometer reads 01h 14m 11s, and the chronometer error is 00m 53s slow. The observed altitude (Ho) is '. LAN occurs at 1150 zone time, and a meridian altitude of the Sun's lower limb is made. The observed altitude (Ho) is '. Determine the vessel's 1200 zone time position. (A) LAT 'N, LONG 'W o (B) LAT 'N, LONG 'W o (C) LAT 'N, LONG 'W o (D) LAT 'N, LONG 'W 6. Determine the distance from LAT 59 12'N, LONG 14 00'W to LAT 59 12'N, LONG 03 20'W, by parallel sailing. o (A) miles o (B) miles (C) miles o (D) miles If choice C is selected set score to A vessel steams 666 miles on course 295 T from LAT 24 24'N, LONG 83 00'W. What are the latitude and longitude of the point of arrival by mid-latitude sailing? o (A) LAT 29 10'N, LONG 94 10'W o (B) LAT 29 13'N, LONG 94 06'W o (C) LAT 29 01'N, LONG 94 18'W (D) LAT 29 06'N, LONG 94 16'W 8. On 25 May your vessel's 1858 zone time position is LAT 'N, LONG 'E. At that time a sextant observation of the planet Venus was made. The sextant altitude is ' and the chronometer reads 08h 59m 15s. The index error is 4.5' off the arc, and the chronometer error is 01m 25s fast. Your height of eye is determined to be 55.0 feet. What is the azimuth (Zn) of the sight using the assumed position? o (A) T o (B) T o (C) T (D) T Page 3 of 5

4 9. The great circle distance from LAT 25 50'N, LONG 77 00'W to LAT 35 56'N, LONG 06 15'W is 3616 miles, and the initial course is T. Determine the latitude of the vertex. o (A) 'N (B) 'N o (C) 'N o (D) 'N 10. On 10 April, your 1630 ZT DR position is LAT 'N, LONG 'W. You are on course 324 T at a speed of 22 knots. What will be the zone time of sunset at your vessel? o (A) 1805 o (B) 1814 o (C) 1818 (D) On 27 August your 0900 zone time DR position is LAT 'N, LONG 'W. Your vessel is on course 071 T at a speed of 20.0 knots. What is the zone time of local apparent noon (LAN)? (A) 1214 o (B) 1208 o (C) 1206 o (D) On 3 April your vessel's 1400 ZT DR position is LAT ' N, LONG ' W. You are steering course 023 T at 18.0 knots. You observed 3 celestial bodies. Determine the latitude and longitude of your 1900 running fix. Body Zone Time GHA Observed Altitude Declination Capella ' ' N ' Sirius ' ' S ' Aldebaran ' ' N ' o (A) LAT 'N, LONG 'W (B) LAT 'N, LONG 'W o (C) LAT 'N, LONG 'W o (D) LAT 'N, LONG 'W Page 4 of 5

5 13. Your vessel is on a course of 052 T at 16 knots. At 0916 a light bears T, and at 0927 the light bears 097 T. At what time and at what distance off will your vessel be when abeam of the light? o (A) 0932, 2.3 miles (B) 0938, 2.9 miles o (C) 0929, 2.0 miles o (D) 0935, 2.6 miles 14. On 2 January your 1759 zone time DR longitude is ' W. At that time you observe Polaris with a sextant altitude (hs) of '. The chronometer time of the sight is 08h 57m 10s, and the chronometer error is 02m 16s slow. The index error is 3.5' on the arc, and the height of eye is 42.5 feet. What is your latitude by Polaris? o (A) 'N (B) 'N o (C) 'N o (D) 'N 15. On 12 September your 0600 zone time (ZT) fix gives you a position of LAT 'N, LONG 'W. Your vessel is on course 062 T, and your speed is 12.3 knots. Local apparent noon (LAN) occurs at 1142 ZT, at which time a meridian altitude of the Sun's upper limb is observed. The observed altitude (Ho) for this sight is '. What is the calculated latitude at LAN? o (A) 'N (B) 'N o (C) 'N o (D) 'N Page 5 of 5

National Maritime Center

National Maritime Center Providing Credentials to Mariners Q207 Navigation Problems-Oceans (Sample Examination) Page 1 of 6 Choose the best answer to the following Multiple Choice questions. 1. On 1 December