COXSWAIN NAVIGATION EXERCISES AUS197 (View as Pdf) NAME:

A deviation card is supplied at the end of this file. Check the answers

 

Question 1

Using any chart (or use the AUS 197 extract) to:

 

1. Identify a distance of one nautical mile, i.e. minute of latitude.

2. Compare one minute of latitude to one minute of longitude.

3. Why is longitude not used to measure distance?

 

 

 

 

Question 2

Obtain any chart (or use the AUS 197 extract) to find the following:

 

1. the value of the magnetic variation and its name (east or west).

2. the year to which that amount of variation refers.

3. any annual change (increasing or decreasing) in minutes.

 

 

 

Question 3

Draw Chart symbols for the following:-

(a) A Steep Coastline. (b) A Lighthouse.

 

 

(c) A rock which dries. (d) An easterly current of 2 knots.

 

 

(e) Sand dunes. (f) A wreck.

 


 

Question 4

 

At a speed of 10 knots, how far will a vessel travel in 3 hours 15 minutes?

a. 53.5 nm miles.

b. 32.5 nm miles.

c. 25.3 nm miles.

d. 35.2 nm miles.

 

 

 

 

Question 5

 

Courses and bearings are plotted on charts as:

a. magnetic.

b. all of the choices.

c. compass.

d. true.

 

 

 

Question 6

 

Corrections to your chart are published in the:

a. Australian Notices to Mariners.

b. Marine Orders.

c. National Tide tables.

d. Australian Marine Notices.

 

 

Question 7

 

Deviation of the compass is caused by:

a. Magnetic influences in the vessel.

b. The earths magnetic field.

c. Magnets in the compass.

d. The moons influence.


 

 

Question 8

 

a What is the distance, in nautical miles, between Bangalley Head and Long Reef Point point?

 

 

_____________________________________________________________

 

b What is the charted depth nearest the position 33o 50'.0S, 151o 20' E?

 

_____________________________________________________________

 

c Describe the lighting characteristics of Macquarie Lt.

 

_____________________________________________________________

 

_____________________________________________________________

 

 

d What is the latitude and longitude of the Barrenjoey Lt ?

 

_____________________________________________________________

 

 

 

 

Question 9

 

a What is the latitude and longitude of the eastern limits of Port Jackson Traffic Regulations area A?

 

_____________________________________________________________

 

 

b A vessel at a speed of 12 knots will travel how far in 2 hours and 45 minutes?

 

_____________________________________________________________

 

 

c South East of Macquarie is a chart symbol, S.Sh What does it mean?

 

_____________________________________________________________

 

d How many nautical miles is equal to one minute of Latitude?

 

_____________________________________________________________

 


 

Question 10

To assist you in learning the buoyage system it is recommended that you make a series of palm cards.

 

For example,

 

Front of Card Back of Card

Draw and colour in one type of mark.

 

-          type of mark

-          lights, colour and rhythm

-          meaning

 
 

 

 

 

 

 

 

 

 

 


A completed example.

-          port hand buoy

-          red light, any rhythm except F1 (2+1) R

-          port side of channel

 

 
 

 

 

 

 

 

 

 

 

 

 

 


Show me some Buoyage cards ready to print out

 

 

 

 


 

Question 11

Find the distances and true directions between the following positions

FROM TO

(a) Shark Island. Sow & Pigs.

(b) South Head. North Head.

(c) 33o 50'.0S 151o 20'.0E 33o 35'.2S 151o 21'.9E

(d) 33o 35'.2S 151o 21'.9E 33o 45'.0S 151o 20'.0E

 

 

 

 

Question 12

Complete the following exercises on magnetic variation by filling in the missing value.

 

1 2 3

True Co

095o

True Co

240o

True Co

357o

Var

5o E

Var

8o W

Var

4o W

Mag Co

 

Mag Co

 

Mag Co

 

 

4 5 6

True Co

005o

True Co

 

True Co

147o

Var

10o E

Var

5o E

Var

o W

Mag Co

 

Mag Co

232o

Mag Co

 

 

7 8 9

True Co

108o

True Co

004o

True Co

358o

Var

4o W

Var

Var

Mag Co

 

Mag Co

002o

Mag Co

003o

 


 

 

Question 13

Look at the local tide tables for your port and determine the heights and times of high and low water. Note the phases of the moon and the springs and neaps.

 

1. What are the times and heights of high and low waters at Sydney on 21 June 2008?

_______________________________________________________________

 

_______________________________________________________________

 

_______________________________________________________________

 

_______________________________________________________________

 

2. What are the times and heights of afternoon high and low at Sydney on 11 August 2008? What is the phase of the moon?

_______________________________________________________________

 

_______________________________________________________________

 

_______________________________________________________________

 

_______________________________________________________________

 

3. What are the times and heights of low water at Sydney on 27 July 2008?

_______________________________________________________________

 

_______________________________________________________________

 

_______________________________________________________________

 

_______________________________________________________________

 

4. What is the earliest time and height of high water at Sydney on 24 May 2008?

_______________________________________________________________


 

 

 

Question 14

North Head Light bore 257 0 M. At the same time Ben Buckler bore 197 0 M. What is the Latitude and Longitude of the vessel?

 

 

____________________________________________________________

 

 

____________________________________________________________

 

 

 

Question 15

At 0500 you fix your position as 33o 49'.5S 151o 20'.0E. You plan a north bound passage to pass Long Reef Point with a clearance of 2 NM.

 

 

What is the compass course to steer? Use the deviation card supplied at the end of this paper.

 

 

 

____________________________________________________________

 

 

 

 

At 0545 Little Reef bears 317o M and the Water Tower (128) behind Narrabean beach bears 241o M. What is your new position?

 

____________________________________________________________

 

 

 

What speed over the ground have you made good between 0500 & 0545.

 

____________________________________________________________


 

 

Question 16

At 0600 you observe Barrenjoey Light come into view.

 

At the same time, Radar gives your following distances off:

 

 

Turimetta Head 2.8 NM distant

 

Little Reef 2.6 NM distant

 

 

What is the Latitude and Longitude of the vessel?

 

 

 

____________________________________________________________

 

 

 

 

What is the compass course to steer to anchor below Box Head? Use the deviation card supplied at the end of this paper.

 

____________________________________________________________

 

 

What will be your ETA at an average speed of 5 knots.

 

____________________________________________________________

 

 

Using the tidal information below, what do you anticipate will be the depth of water over a submerged rock below Box Head (charted depth 3 mtrs)?

 

HW

0127

1.7

LW

0742

0.3

HW

1410

1.5

LW

2042

0.5

 

____________________________________________________________


 

 

Question 18

You are struck by a violent electrical storm. When visibility returns you find the Eastern edge of Barrenjoey Headland dead ahead with the centre of Lion Island in transit. You suspect error in your compass as you are steering 341o C. (Do not use the given deviation tables).

 

 

 

1 What is the new compass error on this heading?

 

 

__________________________________________________________________

 

 

2 Calculate the new deviation of the compass on this heading.

 

 

__________________________________________________________________

 

 

3 Is the deviation different from the deviation card?

 

 

__________________________________________________________________

 

 

4 If yes, explain why and what action would you take.

 

 

__________________________________________________________________

 

__________________________________________________________________

 

__________________________________________________________________

 

_________________________________________________________________

 

__________________________________________________________________

 

__________________________________________________________________


 

 

 

Question 19

1. Define the following:

(a) trade wind.


_______________________________________________________________

(b) pressure gradient.


_______________________________________________________________

(c) sea breeze.


_______________________________________________________________

(d) strong wind warning.


_______________________________________________________________

 

 

 

 

2. Detail the typical weather associated with cold fronts on the NSW East Coast by completing the table.

 

 

 

 

 

 

Before

At the front

After

Wind direction and strength

 

 

 

 

 

 

Barometric Pressure

 

 

 

 

 

 

 

 

Temperature

 

 

 

 

 

 

 

 

 

 

 


 

 

 

 

 

 

 

3 Describe:
(a) how an aneroid barometer works.

 

_______________________________________________________________

 

_______________________________________________________________

 

 

(b) how to take a reading from an aneroid barometer.

 

_______________________________________________________________

 

_______________________________________________________________

 

 

 

 

 

 

Question 20

Inshore coastal areas will have a range of sources of weather information available, some of which will be more reliable or more up to date than others. List these sources in order of importance for reliability or currency.

 

 

__________________________________________________________________

 

__________________________________________________________________

 

__________________________________________________________________

 

_________________________________________________________________

 

__________________________________________________________________

 

__________________________________________________________________

 

__________________________________________________________________

 

_________________________________________________________________

 

 

 

 

 

 

 

 

 

 

 

 

DEVIATION CARD 2 COASTAL NAVIGATION

Magnetic Heading

Deviation

 

Ships Head By Compass

356

4W

 

000

 

015

5W

 

020

 

034

6W

 

040

 

056

4W

 

060

 

078

2W

 

080

 

099

1W

 

100

 

121

1E

 

120

 

143

3E

 

140

 

164

4E

 

160

 

186

6E

 

180

 

208

8E

 

200

 

230

10E

 

220

 

248

8E

 

240

 

266

6E

 

260

 

283

3E

 

280

 

301

1E

 

300

 

319

1W

 

320

 

338

2W

 

340

 

356

 

4W

 

360

Study example only - Not for navigation

 

 

Ranger Hope 2008