QUESTION PAPER 7

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SECTION – A

                                                             TERRESTRIAL NAVIGATION                             (25 marks)

 

  1.   Explain with a suitable diagram, how position can be obtained by obtaining Horizontal

sextant angles between three light houses?                                                                  (5 Marks)

 

  1. On 22th Oct 1992 at noon, a ship in DR posn 13⁰ 35’ S ; 122⁰ 56’E, set courses as follows:-

 

Time Compass Co. Dev Var Leeway Wind Distance
1200-2000 093⁰ 3⁰ E 4⁰ W 3⁰ NE 93
2000-0200 108⁰ 2⁰ E 4⁰ W 3⁰ SE 72
0200-0800 074⁰ 3⁰ E 2⁰ W 4⁰ SE 66
0800-1200 137⁰ 2⁰ E 1⁰ W 3⁰ S 52

 

The ship experienced a current setting NE’ly at 1.5 Knots throughout the above period.

Find :-

  1. Course and Distance made good from noon to noon.
  2. Find the set and drift if the observed position on 23rd N/N was 14⁰4’ S ; 128⁰ 22.2’E.

( 10 Marks)

 

  1. Correct the following sextant altitude applying each correction separately.
  2. Sun’s UL sext alt. 35⁰1’; IE 1.0’ on the arc: HE 12.8 mtrs on 14th Oct 1992.
  3. Star Capella sext alt. 23⁰7:  IE 1.2’ off the arc: HE 11.0 mtrs  on 17th Oct 1992.

( 10 Marks)