Proposed Tutor Marked Assignment-June 08

SECTION I (Navigation)

Q1. i. With the help of a suitable sketch describe the occurrence of Total Solar Eclipse. 5

ii. Describe Apparent Sun, Mean Sun and Dynamic Mean Sun. 5

Q2. i. What is a Position Line? Will the position line obtained by Intercept method differ from that obtained using Long by Chron Method for the same celestial observation? Give Reasons in support of your answer. 5

ii. What corrections are applied to the sextant altitude of Pole Star to calculate Observed Latitude of observer? 5

Q3. An observer in position 22° 05.0’N 034° 12.5’W found the true altitude of a star with declination 10° 15’N to be 41° 02’ west of the meridian. If GHA Aries at that instant was 223° 12’, find the Star’s SHA. 10

Q4. On 19th Jan 1992, at about 1530 at ship in DR 40° 16’S 175° 31’E, the sextant altitude of Sun’s LL was43° 27.4’ when the chron (error 02m 12s fast ) showed 03h 50m 12 s. If HE was 22m and IE was 1.5’ on the arc, required the direction of the PL and a position through which it passes. 10

Q5. i. On 1st May 1992, in DR longitude 179 58’E, the observed altitude of the Sun’s LL on the meridian was 64 35.9’ south of the observer. If HE was 15m, find the latitude and the PL.

ii. Define True Zenith Distance and Meridional Zenith Distance. 3

SECTION II (Chart Work)

Q.6 With respect to passage planning state the information available from the following nautical publications: 10

i. Admiralty Sailing Directions

ii. Routeing Charts

iii. Mariner’s Handbook

iv. Weekly Notices to Mariners

v. Admiralty List of Radio Signals

Q7. Using the following abstract from Admiralty Tide Tables Volume III, calculate the Depth of water at 1348hrs at a berth in Port X where the charted depth is 5.8m. 10

Time Height

0125 3.2

16 0712 6.8

F 1401 2.4

2138 5.9

Q8. i. Differentiate between the Geographical Range, Nominal Range and Luminous Range of lights. 5

ii. What are clearing marks in Chart Work? Explain with suitable sketches. 5

Q9. A vessel at 1000 hrs observed the following compass bearings: 7

Needles Point Light House 319° (C)

St. Catherine Point Light House 359° (C)

Nab Tower Lt. House 050° (C)

Find the ship’s Position and Deviation if the Variation was 6° W.

Q10. A ship steering 106° (C) at 12 knots, at 0900 hrs observed Pte. De Barlfleur Lt. Ho. Bore 145°(C) and at 1100 hrs the same light house was abeam. A current was known to be setting 346° (M) at 2 knots throughout. Find the vessel’s position at 0900 and 1100 Hrs. (Deviation 4.4° W, Variation 6° W) 8

Q11. At 1700 hrs Vertical Sextant Angle of Hardy Monument (240m) was 1° 03’ and the Bill of Portland Lt. Ho. (43m) was 00° 10’. Find the ship’s position. 5