CHECK YOUR PROGRESS ANSWERS:      

NAVIGATION 2 AUS 811                                                   

Question 1

a          What is the distance, in nautical miles, between Mermaid reef and Perpendicular point?

            8 NM

b          What is the charted depth nearest the position 31o 45'.0S, 152o 50.3' E?

           29 Mtr

c          Describe the lighting characteristics of Tacking Point Lt.

            White Flashig light, Group of 4 every 20 seconds, Height 34 mtrs, nominal range 16 NM

d          What is the latitude and longitude of the highest point of Transit Hill ?

            31o 27'.9S, 152o 55.2' E

 

Question 2 

a          What is the latitude and longitude of the entrance to the Hastings River?

            31o 25'.6S, 152o 55.0' E

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

            33 NM

c          East of Diamond Head there is a chart symbol,  CoS  What does it mean?

            Coral with sand

d          How many nautical miles corresponds to one minute of Latitude?

            One


 

Question 3

Complete the following compass error table.

True Course

Variation

Magnetic Course

Deviation

Compass Course

Compass Error

0200

200 E

0000

70 W

0070

170 E

3290

160 E

3130

30 W

3160

130 E

1240

90 W

1330

10 W

1340

100 W

2470

120 E

2350

80 E

2270

200 E

True Course

Variation

Magnetic Course

Deviation

Compass Course

Compass Error

2950

120 E

2830

30 E

2800

150 E

2020

160 E

1860

60 E

1800

220 E

3080

90 W

3170

30 W

3200

120 W

2180

100 E

2080

80 E

2000

180 E

 

Question 4

At 1400 Crowdy Head  Light bore 215.5 0 M. At the same time Grants Head bore 257.5 0 M. What is the Latitude and Longitude of the vessel?

                      31o 36'.0S,                        153o 03.6' E

 

 

Question 5

At 8.0 knots, how far will a vessel travel in 2 hours 15 minutes?

a.         11.0 n miles

b.         19.0 n miles

c.         18.0 n miles

d.         22.0 n miles

 

Question 6

Courses and bearings are plotted on charts as:

a.         magnetic.

b.         all of the choices.

c.         compass.

d.         true.

 

Question 7

The variation for your area of your passage can be found:

a.         from the radar.

b.         from the deviation card.

c.         from the tide tables.

d.         from the chart’s compass rose.

 

Question 8

Deviation of the compass is caused by:

a.         Magnetic influences in the vessel.

b.         The earth’s magnetic field.

c.         Magnets in the compass.

d.         The moon’s influence.


Question 9

Your vessel has Mt. Cairncross (533) and Queens Head (32) in transit dead ahead. Your compass heading is 266C. You suspect your deviation card is wrong, find:

a          The compass error on this heading.    (26o E     /4 marks)

__________________________________________________________________

b          Calculate the deviation of the compass on this heading.     (13.5 o E     /2 marks)

__________________________________________________________________

c          Is the deviation different from the deviation card?      (Yes     /4 marks)

__________________________________________________________________

d          If yes, explain why and what action would you take.      (     /6 marks)

Re-swing compass


Question 10

You fix your vessel’s position by radar at 1230

            Eastern edge of Point Plomer                               range 1.3 NM

            Green Islet                                                               range 3.4 NM

            Tacking Point Light                                               range 10.2 NM

What is the Latitude and Longitude of the 1230 position? What is the compass course to steer to a pass Tacking Point Light at a distance of 1 NM. If the vessels speed is 7 knots, at what time will Tacking Point Light and Transit Hill (118) be in transit?

Lat & Long:                 31o 18'.8S,                        153o 00.0' E

CCTS:                        192T - 12.5 o E =  179.5M - 5.5 o E = 174M

ETA:                           1230 + 1.5 Hrs = 1400

 

 

Question 11

List four sources of weather information.

1. TV

2. Newspaper

3. Internet

4. Volunteer Marine Rescue Radio Bases


Question 12

On a weather chart three and a half feathers on a wind arrow indicates a wind strength of:

a.     12.5  knots

b.     35   knots

c.     25    knots

d.     15    knots

 

Question 13

A barometer or barograph assists weather forecasting by indicating:

a.     the atmospheric pressure
b.     the rise and fall of atmospheric pressure
c.     the amount and rate of change in pressure
d.     all of the choices

 

Question 14

Lines on a weather map joining places of equal mean sea level pressure are called:

a....... fronts

b.     equidistants

c.     isobars

d.     ridges

 

Question 15

You should never “tap the glass” of an aneroid barometer as this will damage it.

TRUE     FALSE

 

Question 16

A STRONG WINDS WARNING indicates average winds above:

a.     26 knots
b.     25 knots
c.     34 knots
d.     48 knots

Question 17

In the Southern Hemisphere wind travels clockwise around a low pressure system.

TRUE      FALSE

Question 18

Buys Ballot’s law states that if an observer (in the Southern Hemisphere) stands facing the wind the centre of a low pressure system will lie:

a.     to the observers left
b.     to the observers right
c.     directly behind the observer
d.     four points to the observers right

 

Question 19

Forecast wind and wave heights from the Bureau Of Meteorology warn that they are averages only and may in fact be:

a.     20% lower        
b.     40% higher
c.     20% higher
d.     40% lower

 

Question 20

A land breeze is one that blows onto the land after nightfall.

TRUE      FALSE

Question 21

What type of tides are experienced with the first quarter of the moon?

a          Lunar tides

b          Spring tides

c          Neap tides

d          Diurnal tides

 

Question 22                                                                               

a        Chart Datum

b        Lowest Astronomical Tides

c        Mean Sea Level

d        Mean High Water Springs

3.6 metres


DEVIATION CARD

Magnetic Heading

Deviation

Compass Heading

353°

6°W

000°

014°

6°W

020°

035°

5°W

040°

056°

4°W

060°

078°

2°W

080°

099°

1°W

100°

120°

0°E

120°

142°

2°E

140°

164°

4°E

160°

186°

6°E

180°

208°

8°E

200°

230°

10°E

220°

247°

7°E

240°

266°

6°E

260°

283°

3°E

280°

301°

1°E

300°

317°

3°W

320°

336°

4°W

340°

355°

6°W

360°

This table is for a fictitious vessel & should not to be used for navigation.

Checked by:

Approved by:

                                     Ranger Hope © 2008 (contains reworked material courtesy of ANTA)