COXSWAIN NAVIGATION ANSWERS AUS197

Question 1

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

1. Identify.

2. See the show

3. See the show

Question 2

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

1. 12^o 35'.0 E.

2. 1994.

3. increasing annually 1’ East.

Question 3

See Chart 5501symbols and abbreviations-

Question 4

b. 32.5 nm miles.

Question 5

d. true.

Question 6

a. Australian Notices to Mariners.

Question 7

a. Magnetic influences in the vessel.

Question 8

a 7.3 nm

b 50 mtre contour

c White flashing in group of two every !0 seconds, 105 mtrs to centre of light, nominal range 25 nautical miles

d 33^o 34'.9S 151^o 19'.65E

Question 9

a 33^o 50'.0S 151^o 21'.6E

b 31 nm

c Sand & shell

d One

Question 10

Show me some Buoyage cards ready to print out

Question 11

(a) 1.45 nm 027^o T

(b) 1.15 nm 055^o T

(c) 15 nm 006^o T

(d) 10 nm 190^o T

Question 12

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

1 2 3

True Co	095^o	True Co	240^o	True Co	357^o
Var	5^o E	Var	8^o W	Var	4^o W
Mag Co	090^o	Mag Co	248^o	Mag Co	001^o

4 5 6

True Co	005^o	True Co	237^o	True Co	147^o
Var	10^o E	Var	5^o E	Var	½^o W
Mag Co	355^o	Mag Co	232^o	Mag Co	147.5^o

7 8 9

True Co	108^o	True Co	004^o	True Co	358^o
Var	4½^o W	Var	1.5^o E	Var	5^o W
Mag Co	112.5^o	Mag Co	002½^o	Mag Co	003^o

Question 13

1.

0405

0.44

0958

1.27

1523

0.60

2157

1.76

2.

1615

1.45

2320

0.60

3.

0834

0.51

2206

0.54

4.

1102

1.23

Question 14

33^o 50'.0S 151^o 19'.5E

Question 15

004^o C

33^o 42'.9S 151^o 22'.0E

5.14 kts

Question 16

33^o 41'.5S 151^o 22'.1E

341^o C

0744

3.3 mtrs

Question 18

1 9^o W

2 22^o W

3 Yes 22^o W new 3^o W old

4 Magnetic influences in the vessel have changed, navigate with extreme caution & have compass re-swung.

Question 19

(a) Prevailing winds in tropical zones
(b) the steepness of the pressure difference beween isobars

(c) Afternoon winds caused by warm land & colder sea
(d) 25 kts

2.

	Before	At the front	After
Wind direction and strength	NE/SE backing to SW	S	S backing to SE
Barometric Pressure	Dropping	Sudden rise	Becoming steady
Temperature	Steady	Drops	Rises

3
Measures the effect of air pressure change exerted on a partial vacuum flask

Synchronise the pointer, tap the glass, note the change.

Question 20

Bom

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