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NAVIGATION 1 AUS 802 Wilsons Prom. Answers

Use chartlet and the deviation card provided at the end of this file.

Question 1 (10 Marks)

Plot the following positions:

Position 1 Lat 39º 17.´0 S Long 146º 03.´8 E

Position 2 Lat 39º 08.´0 S Long 146º 14.8 E

Then find:

a. the true course to steer from Position 1 to Position 2

b. the time taken to steam from Position 1 to Position 2 at a speed of 6.25 knots

c. the ETA at Position 2 if the time of departure from Position 1 was 2245 on 1^st April

Question 2 (10 Marks)

South East Point, Wattle Island and the centre of Rodondo Island were all at a radar range of 3 miles. Fix the ship’s position and find the compass deviation if South East Point bore 020 by ships compass. Use a Variation of 13°E, but do not use the Deviation Card provided.

Question 3 (15 Marks)

At 1100 the summit of Norman Is (96) bore 050º.5M and Citadel Is. Lt bore 097ºM.

The vessel then steered a course of 127ºM at 5 knots.

At 1230, Cleft Is (113) (Skull Rock) bore 068ºM, and the radar range of its nearest edge was 7.2 miles.

Use a Variation of 13°E in this question.

Now do the following:

a. plot and record the 1230 DR position

b. plot and record the 1230 Fix position

c. find the course made good between 1100 and 1230

d. find the speed made good between 1100 and 1230

e. find the set drift and rate of the current experienced between 1100 and 1230

Question 4 (15 Marks)

At 1400 South East Point Light bore 278°M, and the radar range of the nearest edge of South East Point was 6.0 miles.

Find the compass course to steer to pass 1 mile to the north of Forty Foot Rocks, allowing for a current setting 130ºT at a rate of 1.5 knots and leeway of 10º from a strong northerly wind. The vessel’s speed is 6 knots.

Also calculate the Course Made Good, the Speed Made Good, and the E.T.A. when abeam of the summit of Rodondo Is

Use the Deviation Card provided and a Variation of 13°E.

Question 5 (15 Marks)

At 2115 in calm conditions and no current, steaming at 10 knots on a course of 217ºC, Cliffy Is. Lt. bore 267º.5C. Later on at 2130, the light bore 333º.5C. Using the running fix method, fix the ship’s position at 2130.

Then find the compass course to steer, and the required ship’s speed to reach a way point in Lat 39º 07´.5 S 146º 30´.0 E at 2306. Use the Deviation Card provided and a Variation of 13°E.

Question 6 (10 Marks)

Using the tidal information provided at the internet site find the times and heights of the tides at Sydney on 1/6/08.

Question 7 (6 Marks)

Using the Australian National Tide Tables graph and the tidal information calculate the height of the tide Eden at 0700 on Sunday 1/6/08

Question 8 (4 Marks)

Find the under keel clearance of a vessel drawing 3 metres passing over a charted depth of 2.5 metres. Height of tide 2 metres.

Question 9 (1 Mark)