QUESTION PAPER 2

1. Explain Gnomonic and Mercator Projection and list its advantages and disadvantages.  (10)
2. Find the initial course and the final course along the Great Circle track between the

Position

From                                                                           To

Latitude  49⁰ 50’ N                                                      32⁰29’N

Longitude 005⁰ 15’E                                                  064⁰00’W                                     (10)

 

3. a) Find the length of 1⁰ Longitude if 1^o of Latitude on a Mercator Chart measures

12 cms in Latitude 40⁰S.                                                                                                    (3)

 

1. b) On 4 May a Ship in position 00 10’N 68⁰ 09 E set course as follows:-

Time     Co       Dev       Var      Leeway        Wind        Log

1200    126⁰        2⁰E         4⁰E          3⁰              SW            0

A/C    1800    149⁰        3^oE         4⁰E         2⁰              NE           89

A/C     2300    210⁰        1⁰W        5⁰E         3⁰              SE         168

2400                                                                                180

A current set the vessel 183 T at 1.5 knots  throughout.  Find the EP at 2400 Hours    (7)

4. Find the initial course, final course and distance along the Composite circle track.

From                                                         To

Latitude                  37⁰48’N                                                    35⁰40’N

Longitude                122⁰ 40’W                                                141⁰ 00’E

If the maximum Latitude is 45⁰N                                                                                        (10)

5. List the information you will obtain from the following publications:
6. a) Admiralty Sailing Direction                                                                                        (3)
7. b) The Mariner’s Hand book                                                                                           (3)
8. c) Catalogue of Charts and Admiralty Publications                                                        (4)
9. On a voyage from London to Avonmouth
10. a) A vessel steering 250⁰ (c) at  1900hrs, St. Catherine point Lt.bore 302⁰ (c)

and Nab Tower bore 002⁰ ( C ) Find the ship’s position at 1900 hrs.                          (5)

 

1. b) From this position, set a course by compass to pass Bill of Portland Lt. 10 miles

off when a beam on the starboard side – Find the course of  Steer.                             (1)

 

1. c) While on this course at 2100 hrs Anvil point Lt.Ho bore 4 points on the starboard bow          and at 2145 hrs. Anvil point Lt.was a beam on the starboard side Find the ship’s                              position at the time of beam bearing at                                                          (4)

( Variation 14⁰W,  Ship’s speed 12 knots,  Deviation card I.)

7. At 1400hrs the following compass bearings were observed:

Casquet’s lighthouse                             061⁰ (C)

Les Hanois lighthouse                            112⁰ (C)

Roches Douvres lighthouse                   173⁰  (C)

Find the ship’s position and the deviation of the compass for the ship’s head

(variation was 2⁰E)                                                                                                          (10)

 

8. a) A ship in latitude 50⁰ S steers a course of 250⁰ (T) making a D’Long of 20’/ hour.

Calculate the Ship’s speed.                                                                                                (5)

1. b)  Find Course and Distance from 20^o10’N 179^o40’W to 13^o40’N 178^o10É.                       (5)
2. a) In sailing a certain course and distance, the d’lat is 1.5 times the departure

and 0.8 times the d’long.  Find the Middle Latitude and Course Made Good.                 (5)

 

1. b) Vessel’s starting position was 20⁰ 11’N 072⁰ 52’W had set a course of 032^o T

covered a distance of 238 miles during the passage.  Find the position arrived.              (5)

 

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