COXSWAIN NAVIGATION EXERCISES AUS 811 (View as Pdf)

NAME:

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

EXERCISE NO.1 SMALL CRAFT

1. Why should the weight of the boat be slightly forward of the trailer axle?

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2. What problems would occur if your trailer rollers did not spin freely?

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3. What problems might you have if you back your trailer into the water immediately after a long tow to the slip?

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4. On retrieval, why run out the winch cable before backing the trailer into the water?

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5. After winching up you notice that the boat is not straight on the trailer and uneven on all of the rollers. What damage could be caused if you drove away?

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6. Identify the Latitude & Longitude of a position with road access to launch near Wauchope, Telegraph Point and Fernbank Creek. What are the distances to the Breakwall entrance? How long would it take the Duck for the journey? How much fuel would it use?

_____________NM _________________Hrs ______________Ltrs

Assume overall top speed of 20Kts and consumption of 40ltrs an hour.

EXERCISE NO. 2 BUOYAGE Ask your trainer to explain buoyage then,

draw a course from the ocean at A to the upriver wharf at B:

EXERCISE NO. 3 TIDES - USING THE RULE OF TWELFTHS

Ask your trainer about tides and the Rule of Twelfths.

1. The tide tables give the following data for a place on a particular date:

HW 1450; 1.7 metres LW 2050; 0.5 metres

Find the height of the tide at 1850.

2. The tide tables give the following data for a place on a particular date:

LW 1306; 0.3 metres HW 1936; 2.7 metres

At what time will the height of tide be at least 2.5 metres?

3. HW 0927; 9.6 metres LW 1533; 2.4 metres

What is the height of the tide at 1130 hours?

4. The tide tables give the following data for Sydney (PM Bar + 30 mins).

LW 0740; 0.5 metres HW 1350; 2.3 metres

The sounding of Port Macquarie bar is 3 metres at chart datum. Find the time when the height of the tide is 5 metres.

5. A yacht approaching PM at HW on the morning of a certain day, takes a sounding of 8.3 metres. What should be the charted depth?

LW 0058; 0.9 metres

HW 0708; 1.7 metres

LW 1305; 1.0 metres

HW 1915; 1.5 metres

Is it springs or neaps?

6. The charted depth of a shoal is 2 metres. What would be the clearance beneath the keel of a yacht drawing 1.5 metres at LW if the Tide Tables showed the following information for that particular day

HW 1117; 6.7 metres

LW 1720; 3.1 metres

7. A vessel drawing 2.3 meters passes over a reef with a charted depth of 3.1 meters. What would be the underkeel clearance if the height of tide was 1.6 meters?

8. At high tide a vessel passes over a bar with a charted depth of 2.6 meters. If the vessel draws 4.1 meters what is the vessels under keel clearance?

HW 0937 1.9m

LW 1514 0.3m

9. The tide tables give the following data for Sydney:

LW 0740; 0.5 metres HW 1350; 2.3 metres

Tide at Port Macquarie is 20minutes after Sydney, and 1hr & 50 minutes after at Wauhope. Estimate the time of HW at Rawden Island, Fernbank Creek and Telegraph Point.

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EXERCISE NO. 4 CHART SYMBOLS AND ABBREVIATIONS

Name and Explain the symbols at the following positions on Chart AUS 811

1. 30^o 37'.4S 153^o 01'.6E

2. 31^o 28'.6S 152^o 56'.3E

3. The northern edge of Pt. Korogoro bearing 270^o True

Grassy Head(19) is in transit with (Ø) Green Island

4. The star type symbol at Mermaid Reef

5. 31^o 39'.9S 152^o 52'.4E

6. The two cross symbols in close at Queens Head?

7. From what points are heights, and, at what datum are soundings measured from on this chart?

8. How up to date is the chart you are working on and where could you find the updating corrections?

9. Name three nautical publications of use on an inshore passage.

EXERCISE No.5 POSITION - DISTANCE - DIRECTION

1. Identify the following places.

(a) 31^o 46'.2S 152^o 48'.5E

(b) 30^o 56'.4S 153^o 06'.1E

(d) 31^o 43'.6S 152^o 48'.2E

2. Find the geographical position of the following.

(a) Tacking Point Lt.

(b) Mt. Cairncross (533)

(d) Crescent Hd. (63)

(e) Crowdy Hd. Lt.

Find the distances and true directions between the following positions

FROM TO

(a) Jolly Nose (246) Middle Brother (555)

(b) Croppys Hill (101) Cliff Pk. (99)

(d) 31^o 05'.2S 153^o 10'.1E 31^o 30'.1S 153^o 31'.2E

(e) 31^o 36'.0S 153^o 04'.4E 31^o 17'.6S 153^o 08'.2E

4. You are in position 31^o 30'.0S 153^o 00.'0E

What is the true bearing of:

(a) Tacking Pt. Lt.

(b) Tank (191) on Grants Hd.

(d) Smoky Cape Lt.

5. A vessel is broken down and gives their position as due east of Nobbies Headland in 73 metres.

(a) What is the Lat/Long position

(b) How far is the vessel from the entrance to the Hastings River

6. A vessel gives it position as Tacking Point Lighthouse is in transit with North Brother Mountain and Queens Head in transit with the Elephants back

(a) What is the Lat/Long position

(b) What is the depth of water

(d) What course will “Rescue Vessel One” steer to reach the vessel

(e) How long would it take “R1” to reach the vessel at 20 Knots

7. A vessel gives its position as Tacking Point bearing 270^oTrue and Camden Head bearing 210^o True

(a) What is the Lat/Long position

(b) How far is the vessel from Port Macquarie

8. A vessel gives its position as Point Plomer bearing 280^oTrue, Camden Head bearing 220^o True and Tacking Point bearing 235^o True.

What would explain the large cocked hat?

(a) What is the Lat/Long position

(b) What is the bearing of the vessel from Port Macquarie

9. A disabled yacht gives its position as 31^o 20’.348 south, 153^o 08’.598 east.

(a) How far is the vessel from Port Macquarie

(b) What depth of water is the vessel in

10. “R1” has picked up an injured person from a yacht at 31^o 35’ S 153^o 01’ E. They have called for an Ambulance to meet them at the Country Comfort Wharf at Port Macquarie. Best speed under the conditions is 15 knots.

(a) What is the ETA of “R1” if the time now is 0925

(b) How long would it take to tow a vessel from the above position at a speed of 7 knots

11 How far will the “R1” travel at:

(a) 23 knots for 5 minutes

(b) 30 knots for 20 minutes

EXERCISE No.6 DEVIATION AND VARIATION.

1. Complete the table below:

TRUE VARIATION MAGNETIC

254⁰ 10⁰E _________

048⁰ 3⁰W _________

287⁰ 6⁰E _________

159⁰ 2⁰W _________

2. Complete the table below:

MAGNETIC VARIATION TRUE

015⁰ 5⁰E _________

132⁰ 7⁰W _________

246⁰ 11⁰W _________

333⁰ 9⁰E _________

3. Complete the table below:

TRUE VARIATION MAGNETIC

146⁰ 9⁰E _________

064⁰ _________ 073⁰

_________ 9⁰W 320⁰

259⁰ _________ 244⁰

146⁰ 14⁰E _________

_________ 11⁰W 090⁰

TRUE	VARIATION	MAGNETIC	DEVIATION	COMPASS
350⁰	12⁰E		6⁰W
137⁰	9⁰E		3⁰E
247⁰	2⁰W		3⁰W
003⁰	4⁰W		7⁰E

4.Complete the table below:

5.Complete the table below:

TRUE	VARIATION	MAGNETIC	DEVIATION	COMPASS	ERROR
075⁰		069⁰	2⁰W
	17⁰W		4⁰E	121⁰
		243⁰		250⁰	8⁰W
359⁰			7⁰E		7⁰W
	8⁰E		0⁰E	321⁰
001⁰		005⁰			9⁰E
228⁰	15⁰E				4⁰E

EXERCISE NO. 7 RELATIVE BEARINGS

1. A vessel steering 035^oC takes the following bearings.

Crescent Hd. (63) 272^oC

Green Islet. 245^oC

Hat Head. 332^oC

Fix the vessels position.

2. A vessel took the following bearings.

NE edge of Scotts Head 291^oC

Smokey Cape Light 250^oC

Hat Head. 213^oC

What is the vessels position if she was steering 170 ^o C

3. A vessel steering 020^oC takes the following bearings with a ships head up un-stabilised display radar.

Tacking Point Light 220^o Rel

NE Edge of Pt. Plomer 291^o Rel

Hastings River 241^o Rel

Fix the vessels position

4. A vessel steering a course of 190^oC takes the following radar bearings.

NE edge of Pt. Plomber 93^o Rel

Diamond Hd. (112) 42^o Rel

Tacking Point Light 70^o Rel

Fix the vessels position.

EXERCISE No.8 WEATHER INFORMATION

1. Define the following:

(a) trade wind
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(b) pressure gradient
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(c) sea breeze
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(d) strong wind warning
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	Before	At the front	After
Wind direction and strength
Barometric Pressure
Temperature

2. Detail the typical weather associated with cold fronts by completing the table.

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

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

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4. A Coxswain at sea in 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.

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DEVIATION CARD 1 NAVIGATION
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 should not to be used for navigation.

DEVIATION CARD 1 NAVIGATION