UPS #268ºW69ºW70ºW67ºW66ºW 37Nº 38º 39º 36º 35º 37Nº 38º 39º 36º 35º...

UPS #268ºW69ºW70ºW 67ºW 66ºW

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35º 68ºW69ºW70ºW 67ºW 66ºW

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Practice CruisePractice Cruise

Junior NavigationJunior Navigation

Chapter 13Chapter 13

DO NOT BECOME FRUSTRATED!!!


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NOTE: Positions shown throughout this practice cruise were determined mathematically. Because of the small scale of the Universal Plotting Sheet, considerable variance in plotted positions will surely result.

Instructors should therefore exercise considerable leeway in assessing each student’s plotting accuracy. No specific tolerances can be offered, since cumulative errors will undoubtedly arise as the cruise continues.

SHOW YOU KNOW WHAT SHOULD BE

DONE AND HOW, NOT ARRIVING AT THE

SAME ANSWERS.SHOW YOU KNOW WHAT SHOULD BE

DONE AND HOW, NOT ARRIVING AT THE

SAME ANSWERS.

PRACTICE OFFSHORE CRUISE – UNDERWAY

In Chapter 11 you completed the planning for this offshore cruise. During the shakedown cruise, you created a deviation tabledeviation table for the steering compass, which is contained at the end of this Practice Cruise; use this deviation table for the cruise exercises.

You have taken departure and have settled down into the daily navigational routine offshore. You review your Navigator’s notebook regularly and update it as needed. You enter information noted in the notebook into the Deck Log, as appropriate – for example, you planned to receive NOAA radiofax transmissions four time daily (Chapter 11 homework, #7), and will record in the Deck Log when these record in the Deck Log when these transmissions are receivedtransmissions are received.

As navigator, you maintain a written Deck Log and manual plotmanual plot of the voyage, using the practices discussed in this course. You plan to log GPS positionslog GPS positions and weatherweather conditions at least once every four hours unless conditions dictate that they should be logged more frequently. You also plan to log celestial EPs or celestial EPs or RFixesRFixes whenever obtained, all course changesall course changes, and any unusual happeningsunusual happenings.

You’ll maintain a DR plot, using the practices discussed in this course and as indicated in this Practice Cruise. Remember to use knotmeter log readings to use knotmeter log readings to establish DR positionsestablish DR positions. In addition, the captain’s standing orders include that all radar contacts be plotted and he be notified if the closest point of approach (CPA) is 4.0 nm or less. You have noted the standing orders in your Navigator’s notebook, and will plot and log accordingly. You will plot the GPS positions, DRs and course changes on the Universal Plotting Sheet (UPS) and use CLS plotting sheets to plot situations that require more detail, as indicated in the Practice Cruise.

The critical items in your Navigator’s notebook related to taking celestial observations are:

Height of eye: 10.0 ft10.0 ft

Index Error (IE): Off the Arc, 0Off the Arc, 0ºº 01.9’ 01.9’ (check before each observation)

Watch error (WE): f 0 – 13 secondsf 0 – 13 seconds

This leg of your cruise starts on 29 June 20XX.


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1. As part of your planning, you divided this voyage into 3 segments (Chapter 11 homework, Questions #2) and planned to plot each voyage segment on a separate Universal Plotting Sheet (UPS). You are near the end of the first segment of the voyage and are about to start the second voyage segment.

• Prepare UPS No. 2, using the Mid-Latitude of 37º N and Mid-Longitude of 68º W.

• From your voyage plan, you note that the variation in this area is 15º W. Plot the 15º W isogonic line using points L1 39º 00’ N, Lo1 69º 20’ W and L2 35º 00’N, Lo2 66º 45’ W.

• You also note that this UPS includes an area where the time zone changes. Plot the appropriate time zone boundary on UPS No. 2.

• You locate two waypoints on Plotting Sheet No. 2 to mark the intended course for this voyage segment. Plot and label WP1 at LWP1 38º 18.8’ N, LoWP1 69º 14.3’ W, and WP2 at LWP2 35º 37.5’ N, LoWP2 67º 03.5’ W.

WP1

WP2

1

30’

20’

10’

30’

40’

Review Chapter 8-9 presentation Review Chapter 8-9 presentation for detailed instructions on for detailed instructions on

preparing this UPSpreparing this UPS

Erase construction lines

LWP1 38º 18.8’ N

LoWP1 69º 14.3’ W


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WP1

WP2

1 THE O

UTER

SCA

LE IS REA

D FR

OM

A

MER

IDIA

N O

F LON

GITU

DE. TH

E

INN

ER SC

ALE FR

OM

A PA

RA

LLEL

OF LA

TITUD

E.

090270

180000

080070

060

050040

030020

010

000

260250

240

230220

210209

190180

100

110

120

130140150

160

170

180

280

290

300

310320330

340350

360

170160

150

140130

350340

330

320310

190

200

210220

230

010

020

030040050

C 147

T 147 V +15W

M 162 D -2E C 160

136º = 1ºE 162º = ? 183º = 3ºE

183 – 136 = 47 ½ 47 = 23.5

136 + 24 = 160 160 = 2º E

a. What is the magnetic course along the rhumb line of this segment? a. ____________________

b. What should be the planned compass course along this rhumb line? b. ____________________

160º CT 47 V +15 M 162 D -2 C 160

162º M

On the final exam should all your work


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WP1

WP2

2

C 147

Cape Hatteras Virg

in Rock 058-238º

WP3

WP4

Cape Hatteras Gibraltar 071-251º

2. You transfer data from your Navigator’s notebook and review the pilot chart. You note that your intended route for this segment crosses two major shipping lanes, Cape Hatteras to Virgin Rocks and Cape Hatteras to Gibraltar (Chapter 11 homework, #1h). You mark the intersection of the shipping lanes and your route with WP3 for the Virgin Rocks route and WP4 for the Gibraltar route, and check these waypoints in your GPS. You also note in your Navigator’s notebook to closely monitor the radar when in the region of the two waypoints, based on the captain’s standing orders regarding radar contacts.

• Plot WP3 & WP4, as well as the course these shipping lanes cross your rhumb line course, on your Plotting Sheet No. 2. The data recorded in your Navigator’s notebook is:

• WP3: L 37º 50’ N, Lo 68º 20’ W, Course 058º – 238º

• WP4: L 36º 40’ N, Lo 67º 20’ W, Course 071º – 251º


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WP1

WP2

3

Cape Hatteras Virg

in Rock 058-238º

WP3

WP4


0400 GPS

C 119 S 6.8

C 133 D +1E M 134 V -15W

T 119

3. 0400: As you begin your watch and start the DR plot, you note the ships heading, psc, is 133ºC and speed has been 6.8 kn. The GPS indicates a position of L 38º 32.6’ N, Lo 69º 49.1’ W. The ship’s knotmeter log reading is 0579.0. Conditions overnight have been Force 3 winds.

a. What is the true DR course? a. ____________________

b. At 0400, what is the range and bearing to the GPS waypoint WP1? b. ____________________

0428: Received NOAA weather fax; logged receipt and placed copy in Navigator’s notebook.

C 133 D +1 M 134 V -15 T 119

119º T

30.6 nm, 117º T

C 147


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DECKLOG – Vessel: Desert First Navigator: J.N. Wanabee From: Martha’s Vineyard, MA To: Bermuda Date: 29 Jun 2012Page: __________

Time ZT

Course (psc)

V D SpeedPosition (L/Lo (note type of position

Weather Remarks

ZD+5

0400 133º 15º W 1º W 6.8 GPS L 38º 32.6’ N Lo 69º 49.1’ W Winds F3Log 0579.0, relieved night watch, no problems reported

0428 Received NOAA radiofax

1

For every time occurrence make For every time occurrence make an entry in the DECKLOGan entry in the DECKLOG!!!!!!


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4

Cape Hatteras Virg

in Rock 058-238º

WP3

WP4


0400 GPS

C 119 S 6.80800 GPS

C 119 S 6.8

C 119 S 6.8

0800 DR: L 38º 19.5’ N Lo 69º 18.8’ W

0400 GPS

0800 GPS

CMG 106 SMG 6.8

Set 023 Dft 1.5

0800

606.1 579.1 27.0nm

x 60 1620.0

/ 240min

6.8kn

4. 0800: The GPS indicates a position of L 38º 25.0’ N, Lo 69º 15.8’ W. The ship’s heading is 133º C and the knotmeter log reading is 0606.1. Wind is Force 3 with scattered white caps. You report the position to the captain.

• Plot the 0800 GPS Fix and DR position, and the CMG from the 0400 GPS fix on a CLS plotting sheet, using L 38º 30’ N and Lo 69º 30’ W for the mid-Latitude and mid-Longitude.

a. What has been the true CMG from the 0400 GPS Fix? a. ____________________

b. What has been the speed through the water (S)? b. ____________________

c. What are the 0800 DR coordinates? c. ____________________

d. What is the set and drift at 0800? d. ____________________

106º

Set 023º, Dft 1.5 kn

6.8 knS=60D/T = 60x(0606.1-0579.1)/240 = 6.8

L 38º 19.5’ N Lo 69º 18.8’ W

C 147


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5

Cape Hatteras Virg

in Rock 058-238º

WP3

WP4


0400 GPS

C 119 S 6.80800 GPS

C 119 S 6.8

0800 Current Vector Diagram

13 - 5

8.0

7.0

6.0

5.0

4.0

3.0

2.0

1.0

0.0

0800 GPS

C 176

S 6.8

TR

169

SO

A 5.5

Set 023 Dft 1.5

WP1

C 176 S 6.8

5. The current has put you off course to the northeast, so you decide to restart your DR course from the 0800 GPS Fix to WP1, adjusting for current. Weather and wind conditions have remained constant so you estimate your speed (S) will continue to be 6.8 kn for this leg.

• Draw a current vector diagram to determine the true course to allow for the current determined in Question #4.

a. What is the true course from the 0800 GPS fix to WP1, not adjusting for current?a.

____________________

b. What is the true course from the 0800 GPS fix to WP1, adjusting for current?b.

____________________

c. What is your expected SOA? c. ____________________

d. What is the compass course to WP1, adjusting for current? d. ____________________

You instruct the helmsman to change to this course.

169º

176º

5.5 kn

T 176 V +15 M 191 D -3 C 188188º

C 147


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0800 188º 3º E GPS L 38º 25.0’ N Lo 69º 15.8’ W Winds F3, scattered white capsLog 0606.1, reported position to captain, 0400-0800 Total drift 6.0nm, Set 023º -

0800 DR L 38º 19.5’ N Lo 69º 18.8’ WDrift 1.5, chg course to WP1, adj for current, estimated Speed 6.5, SOA 5.5

1

For every position (GPS, Fix, DR, For every position (GPS, Fix, DR, RFix, or EP) make an entry in the RFix, or EP) make an entry in the

DECKLOGDECKLOG!!!!!!


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S 6.8

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6

Cape Hatteras Virg

in Rock 058-238º

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0400 GPS

C 119 S 6.80800 GPS

C 119 S 6.8

C 176 S 6.8

0910 GPS

0915

Log 0915

0614.6 Log 0910

0614.0

0.6nm in

5min

6. 0910: You reach WP1 according to your GPS and change course to WP2, restarting the DR plot. You check the plotted course between WP1 and WP2 and confirm it to be 147º. Knotmeter log reading is 0614.0

• You wish to check your sight-taking accuracy by getting a RFix using an LOP of the Sun now, and later in the day, a Meridian Transit of the Sun.

• At 09-15-15 you obtain a good observation on the Sun’s upper limb and record an hs of 55º 59.5’. The knotmeter reading is 0614.6.

• Reduce this sight. Use your 0915 DR position as the reference position. Plot the resultant LOP on a CLS plotting sheet, using L 38º N and Lo 69º W for the mid-Latitude and mid-Longitude, and determine the 0915 EP.

a. What is your 0915 DR position? a. ____________________

b. What is Ho? b. ____________________

c. What is the intercept? c. ____________________

d. What is the azimuth? d. ____________________

e. What are the 0915 EP coordinates? e.____________________

L 38º 18.3’ N Lo 69º 13.9’ W

55º 41.8’

4.7 nm Toward

105º

L 38º 17.4’ N Lo 69º 08.0’ W

C 147


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0910 160º 2º E GPS L 38º 18.8’ N Lo 69º 14.3’ WLog 0614.0, arrived WP1, chg course to WP2

0915 7.2 DR L 38º 18.3’ N Lo 69º 13.9’ WLog 0614.6 Sun UL hs 55º 59.5’, LOP a 4.7nm T Zn 105º

0915 EP L 38º 17.4’ N Lo 69º 08.0’ W

1


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7

Cape Hatteras Virg

in Rock 058-238º

WP3

WP4


0400 GPS

C 119 S 6.80800 GPS

C 119 S 6.8

C 176 S 6.8

0910 GPS

1140

0915

Log 1000

0620.0 Log 0915

0614.6

5.4nm in

45min

S = 60D / T

(60x5.4)/45

S = 7.2kn

1140-0915

2hr 25min

7. 1000: In preparing to take a Meridian Transit sight, you calculate the time that transit of the sun will occur. Based on the time of yesterday’s Meridian Transit, you estimate that Meridian Transit will occur today around ZT 1140. The knotmeter log reads 0620.0. Winds have increased, waves 1-2 ft.

• Plot your expected 1140 DR position on Plotting Sheet #2, using the boat speed (S) experienced during the period 0915-1000.

a. What is your expected 1140 DR position? a. ____________________

b. Using your 1140 DR Lo, what is the calculated time of MT? b. ____________________

• Use the Meridian Transit Form contained at the end of Chapter 9.

1052: Received NOAA weather fax; logged receipt and placed copy in Navigator’s notebook.

L 38º 03.7’ N Lo 69º 01.8’ WD = SxT/60 = 7.2x145/60 = 17.4 nm from 0915 DR

ZT 11-39-34

C 147

S 6.8


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ZD+5







0915 EP L 38º 17.4’ N Lo 69º 08.0’ W

1000 Winds increasing, 1-2ft wavesLog 0620.0 est 1140 DR 38º 03.7’ N Lo 69º 01.8’ W


1


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S 7.3

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WP1

8

Cape Hatteras Virg

in Rock 058-238º

WP3

WP4


0400 GPS

C 119 S 6.80800 GPS

C 119 S 6.8

C 176 S 6.8

0910 GPS

0915

1140 GPS

8. 1130: You prepare to take sights for the Meridian Transit and start before your calculated time of MT. You take a run of sights and select the observation on the lower limb of the sun at WT 11-39-48 with hs of 74º 56.1’. You note that the 1140 GPS position is L 38º 03.5’ N, Lo 69º 02.1’ W and the knotmeter log reads 0632.2, which you use to calculated your current DR position.

• Reduce the sight, using the Meridian Transit Form contained at the end of Chapter 9.

a. What is Ho? a. ____________________

b. What is the calculated latitude from you meridian transit sight? b. ____________________

c. What is the difference between the calculated latitude from your MT sight and the latitude given by the GPS?

c. ____________________

75º 10.6’

L 38º 01.5’ N

2.0 nm

Log 1130

0632.2 Log 0910

0614.0

17.8 nm

S 7.3

C 147

S 6.8


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Cape Hatteras Virg

in Rock 058-238º

WP3

WP4


WP1

90400 GPS

C 119 S 6.80800 GPS

C 119 S 6.8

C 176 S 6.8

0910 GPS

0915

1140 RFix1140 RFix1140 GPS

9. Plot the MT observation on the CLS plotting sheet you prepared for Question #6. Advance the 0915 Sun LOP for a RFix with the 1140 MT. .

a. What are the coordinates of the 1140 RFix? a. ____________________

b. What is the distance between the 1140 GPS fix and the 1140 RFix? b. ____________________

• With the distance between the 1140 GPS fix and 1140 RFix small, you’re now confident that the GPS is working properly. You decide to re-start your DR course line from your next GPS fix.

L 38º 01.5’ N Lo 68º 56.2’ W

4.9 nmC

147

S 6.8

S 7.3


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Time ZT

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ZD+5







0915 EP L 38º 17.4’ N Lo 69º 08.0’ W



1140 7.3 GPS L 38º 03.5’ N Lo 69º 02.1’ W Log 0632.2

1140 DR L 38º 03.5’ N Lo 69º 01.7’ W Sun LL hs 74º 56.1’ MT a 2.0nm T 180º

1140 RFix L 38º 01.5’ N Lo 68º 56.2’ W

1


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WP2

Cape Hatteras Virg

in Rock 058-238º

WP3

WP4


WP1

100400 GPS

C 119 S 6.80800 GPS

C 119 S 6.8

C 176 S 6.8

0910 GPS

0915


1200 GPS

WP5

C 125 S 8.1

10. 1200: The GPS indicates a position of L 38º 01.0’ N, Lo 69º 00.0’ W and the knotmeter log reading is 0634.9. Winds are Force 4 with waves 2-3 ft. After you make your entry in the ship’s Deck Log and report the position to the captain, you check on the NOAA radiofax chart issued at the 1052 weather broadcast. The low pressure system that you had been following during previous forecasts, located off the Caroline coast, is developing faster than expected.

• The forecast indicates that the system is on a course of 035º at a speed of 13 mph and is predicted to cross L 35º 00’ N, Lo 75º 00’ W in 24 hours.

• After conferring with the captain, you decide to avoid the worst of the system by changing to a course of 125ºT, 90 degrees to the system’s track, and increasing boat speed (S).

• Re-start your DR plot from the 1200 position and locate WP5 150 miles away.

a. What is the compass course to WP5? a. ____________________

b. What are the coordinates of WP5? b. ____________________

• Further evaluation of the weather data indicates that the system is approximately 200 miles in diameter with winds that could approach Force 5. You note that the winds will shift from the SW to S, and then to the SE as the system passes. You decide to:

• Start logging your position, either DR or GPS, every two hours until the weather system passes.

• Follow the route from the 1200 fix to WP5.

• Instruct the helmsman to follow the route as closely as possible, but to also follow the wind to minimize the strain on the boat and crew.

L 36º 35.0’ N Lo 66º 25.5’ W

139ºT 125 V +15 M 140 D -1 C 139

C 147

S 6.8

S 7.3


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ZD+5







0915 EP L 38º 17.4’ N Lo 69º 08.0’ W



1140 7.3 GPS L 38º 03.5’ N Lo 69º 02.1’ W Log 0632.2


1140 RFix L 38º 01.5’ N Lo 68º 56.2’ W

1200 139º 1º E 8.1 GPS L 38º 01.0’ N Lo 69º 00.0’ WWinds F4, waves 2-3ft, low pressure area developing fast

Log 0634.9, reported position to captain, change course to avoid storm, with orders to

tracking 035º 13mph approx 200 miles in diameter, expect

follow wind to minimize strain on boat and crew

SW winds changing to S, then SE with F5 winds

1


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S 8.5

WP2

Cape Hatteras Virg

in Rock 058-238º

WP3

WP4


WP1

110400 GPS

C 119 S 6.80800 GPS

C 119 S 6.8

C 176 S 6.8

0910 GPS

0915


1200 GPS

WP5

C 125 S 8.1

1400

1400 651.9

1200 634.9

D = 17.0

S = 8.5

11. 1400: The knotmeter log reads 0651.9. Winds are at Force 4 and increasing.

• Plot the 1400 position on Plotting Sheet #2, and make the appropriate Deck Log entry.

D = 651.9 – 634.9 = 17.0 nm from the 1200 GPS position.

C 147

S 6.8

S 7.3


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ZD+5







0915 EP L 38º 17.4’ N Lo 69º 08.0’ W



1140 7.3 GPS L 38º 03.5’ N Lo 69º 02.1’ W Log 0632.2


1140 RFix L 38º 01.5’ N Lo 68º 56.2’ W

1200 139º 1º E 8.1 GPS L 38º 01.0’ N Lo 69º 00.0’ WWinds F4, waves 2-3ft, low pressure area developing fast

Log 0634.9, reported position to captain, change course to avoid storm, with orders to

tracking 035º 13mph approx 200 miles in diameter, expect

follow wind to minimize strain on boat and crew

SW winds changing to S, then SE with F5 winds

1400 8.5 DR L 37º 51.2’ N Lo 68º 42.3’ W Log 0651.9

J.N. Wanabee, AP

1


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WP2

Cape Hatteras Virg

in Rock 058-238º

WP3

WP4


WP1

120400 GPS

C 119 S 6.80800 GPS

C 119 S 6.8

C 176 S 6.8

0910 GPS

0915


1200 GPS

WP5

C 125 S 8.5

1400

1600

1600 GPS

12. 1600: The knotmeter log reads 0668.9 and the GPS position is L 37º 54.5’ N, Lo 68º 17.7’ W. Winds have increased to Force 5, waves to 5 ft with some spray. After plotting and logging the 1600 GPS position you compare the past two log entries with your plotting sheet. You make note that the SMG for the past 4 hours has been 8.5 kn.

You note that the 1600 GPS position is to the NE of the course line to WP5; this doesn’t concern you, since helmsman was instructed to follow the winds to minimize the strain on the boat and crew, and the winds from the storm have been primarily from the SW. You also note that the 1600 position is very close to the shipping lane between Cape Hatteras and Virgin Rock.

• You immediately have the radar turned ON, and confirm it is operating and being monitored by one of the crew.

• Plot the 1600 GPS position on Plotting Sheet #2, and make the appropriate Deck Log entry.

a What is the distance from your 1600 position to where you will cross the Cape Hatteras to Virgin Rock shipping lane?

a. ____________________

4.7 nm

C 147

S 6.8

S 7.3

S 8.5


37Nº

38º

39º

36º

35º

37Nº

38º

39º

36º


15º W Var

15º W Var

(ZD +5) (ZD +4)

(ZD +5) (ZD +4)


Time ZT

Course (psc)


Weather Remarks

ZD+5

1600 139º 15º W 1º E 8.5 GPS L 37º 54.5’ N Lo 68º 17.7’ W Winds F5, waves 5ftLog 0668.9, approaching Cape Hatteras to Virgin Rock shipping lane, turned on radar

2


37Nº

38º

39º

36º

35º

37Nº

38º

39º

36º


15º W Var

15º W Var

(ZD +5) (ZD +4)

(ZD +5) (ZD +4)

Cape Hatteras Virg

in Rock 058-238º

WP3

WP4


WP2

WP1

130400 GPS

C 119 S 6.80800 GPS

C 119 S 6.8

C 176 S 6.8

0910 GPS

0915


1200 GPS

WP5

C 125 S 8.5

1400

1600

1600 GPS

1614 GPS

1634 GPS

CH-VR 058

WP3

1600 GPS

1614 Radar 25.5nm 073

1634 Radar 14.9nm 076

237

S = 60D / T

S = 60x8.3/20

S = 24.9

24.9

T = 60D / S

T = 60x9.3/24.9

T = 22.4

1634+22 = 1656

SMG=3.0x60/20

SMG=9.0

T=60D/SMG

T=60x6.8/9.0

T=45.3min

1634+45 = 1719

CPA

13. 1614: The radar picks up a large contact at a range of 25.5 nm, on a bearing of 073ºT; the GPS position at this time is L 37º54.2’N, Lo 68º15.4’W and the knotmeter log reads 0670.9. Twenty minutes later, the GPS indicates you position is L 37º53.6’N, Lo 68º11.7’W with knotmeter log reading 0673.7; a second radar reading at this time indicates the contact at a range of 14.9 nm, bearing 076ºT.

• Plot this situation on a CLS plotting sheet, using L 38ºN and Lo 68º10’W for the mid-Latitude and mid-Longitude.

a. What is the ship’s course? a. ____________________

b. What is the ship’s speed? b. ____________________

c. What time will the ship cross your track? c. ____________________

d. What time will your vessel cross the ship’s path? d. ____________________

237º

24.9 kn

SMG = 60D/T; 60x8.3/20 = 24.9

1656

T = 60D/SMG; 60x17.6/24.9 = 42.41 ETA 1614+0042 = 16561719

T =60D/SMG = 60x6.8/(3.0x60/20) = 45.33 ETA 1634+0045 = 1719

C 147

S 6.8

S 7.3

S 8.5


37Nº

38º

39º

36º

35º

37Nº

38º

39º

36º


15º W Var

15º W Var

(ZD +5) (ZD +4)

(ZD +5) (ZD +4)

WP2

Cape Hatteras Virg

in Rock 058-238º

WP3

WP4


WP1

0400 GPS

C 119 S 6.80800 GPS

C 119 S 6.8

C 176 S 6.8

0910 GPS

0915


1200 GPS

WP5

C 125 S 8.5

1400

1600

1600 GPS

13

• You note the ship’s closest point of approach (CPA) may be within the 4.0 mile limit of the captain’s standing orders.

e. Should circumstances require it, what true course should you be prepared to make?

e. ____________________

f. What would be the compass course for this action? f. ____________________

• Although there appears to be no need for avoidance action, you report your position and intention to the captain. He agrees that no course change is necessary.

1652 Received NOAA weather fax; logged receipt and placed copy in Navigator’s notebook.

057º (+/- 5º)

073º (+/- 5º)

T 057 V +15 M 072 D +1 C 073

180º from the ship’s course

you

target

C 147

S 6.8

S 7.3

S 8.5


37Nº

38º

39º

36º

35º

37Nº

38º

39º

36º


15º W Var

15º W Var

(ZD +5) (ZD +4)

(ZD +5) (ZD +4)

DECKLOG – Vessel: Desert First Navigator: J.N. Waunakee From: Martha’s Vineyard, MA To: Bermuda Date: 29 Jun 2012

Page: __________Time ZT

Course (psc)


Weather Remarks

ZD+5


1614 8.6 GPS L 37º 54.2’ N Lo 68º 15.4’ W Winds F5 Log 0673.7, target Brg 073º, range 25.5nm

1634 8.4 GPS L 37º 53.6’ N Lo 68º 11.7’ WLog 0673.7, target Brg 076º, range 14.9nm, target on course 237º at 24.9kn, reported

to captain, paths cross 1719 target 1656 maintain course


2


37Nº

38º

39º

36º

35º

37Nº

38º

39º

36º


15º W Var

15º W Var

(ZD +5) (ZD +4)

(ZD +5) (ZD +4)

WP2

Cape Hatteras Virg

in Rock 058-238º

WP3

WP4


WP1

140400 GPS

C 119 S 6.80800 GPS

C 119 S 6.8

C 176 S 6.8

0910 GPS

0915


1200 GPS

WP5

C 125 S 8.5

1400

1600

1600 GPS

1730

1140 RFix1730 GPS

1600 DR: L 37º 41.5’ N Lo 68º 24.7’ W

14. 1730: The GPS indicates a position of L 37º52.1’N, Lo 68º01.8’W and the knotmeter log reads 0681.7. Winds are F5, with waves 6 ft. The ship is now well past your position.

• Checking your DR plot of the past several hours, you decide to determine the set and drift indicated by the 1600 GPS fix. You used the 1600 knotmeter log reading to calculate the speed and distance from the 1200 GPS position, and then plotted the 1600 DR and the GPS positions on a CLS plotting sheet, using L 38ºN and Lo 68º30’W for the mid-Latitude and mid-Longitude.

a. What were the 1600 DR coordinates? a. ____________________

b. What is the set at 1600? b. ____________________

c. What is the drift at 1600? c. ____________________

d. What was the true CMG between 1200 and 1600? d. ____________________

D = (0668.9 - 0634.9) = 34nm from 1200 position

L 37º 41.5’ N Lo 68º 24.7’ W

023º

101º

3.5 knS = 60xD/T = 60x14.1/240 – 3.5 kn

C 147

S 6.8

S 7.3

S 8.5


37Nº

38º

39º

36º

35º

37Nº

38º

39º

36º


15º W Var

15º W Var

(ZD +5) (ZD +4)

(ZD +5) (ZD +4)

See CLS Plot

1730 GPS

WP2

Cape Hatteras Virg

in Rock 058-238º

WP3

WP4


WP1

0400 GPS

C 119 S 6.80800 GPS

C 119 S 6.8

C 176 S 6.8

0910 GPS

0915


1200 GPS

WP5

C 125 S 8.5

1400

1600

1600 GPS

1730


13 - 14

8.0

7.0

6.0

5.0

4.0

3.0

2.0

1.0

0.0

1730 GPS

C 177

S 8.5

TR

161

SO

A 5.5

Set 023 Dft 3.5

14

• You decide to change course to WP2, restarting the DR plot from the 1730 GPS position and accounting for the newly calculated set and drift. Draw a new current diagram to determine your new course to steer and expected speed of advance to WP2.

e. What will be the compass course to steer to WP2? e. ____________________

f. What will be the speed of advance to WP2? f. ____________________

• You instruct the helmsman to change to this new course.

• Due to the winds and sea state, you continue the 1200 orders to the helmsman to follow the wind to minimize stress on the boat and crew. You expect the weather conditions will continue to set the boat to the NE. You decide to cover the 1600 to 1730 events by plotting on the two GPS positions for those times on the UPS sheet, and inserting a note on the UPS referencing the previous CLS plotting sheet.

189º C

5.5 kn

T 177 V +15 M 192 D -3 C 189

C 147

S 6.8

S 7.3

S 8.5


37Nº

38º

39º

36º

35º

37Nº

38º

39º

36º


15º W Var

15º W Var

(ZD +5) (ZD +4)

(ZD +5) (ZD +4)


Time ZT

Course (psc)


Weather Remarks

ZD+5






1730 189º 3º E 8.6 GPS L 37º 52.1’ N Lo 68º 01.8’ W Winds F5, waves 6ftLog 0681.7, 1200-1600 Tot Drift 14.0nm Set 023º drift 3.5, changed course to WP2

1730 DR L 37 41.5’ N Lo 68 24.7’ W

2


37Nº

38º

39º

36º

35º

37Nº

38º

39º

36º


15º W Var

15º W Var

(ZD +5) (ZD +4)

(ZD +5) (ZD +4)

See CLS Plot

1800

1730 GPS

WP2

Cape Hatteras Virg

in Rock 058-238º

WP3

WP4


WP1

150400 GPS

C 119 S 6.80800 GPS

C 119 S 6.8

C 176 S 6.8

0910 GPS

0915


1200 GPS

WP5

C 125 S 8.5

1400

1600

1600 GPS

1730

TR 161 SOA 5.5

C 177 S 8.5

1800 – 686.0

1730 – 683.7

D = 2.3 nm

15. 1800: The knotmeter log reads 0686.0. Winds have decreased a bit but are still at Force 5 and waves are running to 4-5 ft. You review the 1652 weather fax and find that the storm is predicted to pass your present position quickly and that winds should start to moderate in the next hour.

C 147

S 6.8

S 7.3

S 8.5


37Nº

38º

39º

36º

35º

37Nº

38º

39º

36º


15º W Var

15º W Var

(ZD +5) (ZD +4)

(ZD +5) (ZD +4)


Time ZT

Course (psc)


Weather Remarks

ZD+5







1730 DR L 37 41.5’ N Lo 68 24.7’ W

1800 4.6 DR L 37º 47.8’ N Lo 68º 01.8’ WWinds F5 and dropping, waves 4-5ft, reviewed 1652 radiofax,

Log 0686.0

Weather should moderate in 1 hour

2


37Nº

38º

39º

36º

35º

37Nº

38º

39º

36º


15º W Var

15º W Var

(ZD +5) (ZD +4)

(ZD +5) (ZD +4)

See CLS Plot

1730 GPS

WP2

Cape Hatteras Virg

in Rock 058-238º

WP3

WP4


WP1

160400 GPS

C 119 S 6.80800 GPS

C 119 S 6.8

C 176 S 6.8

0910 GPS

0915


1200 GPS

WP5

C 125 S 8.5

1400

1600

1600 GPS

1730

TR 161 SOA 5.6

C 177 S 8.5

1800

2000

2000 GPS

16. 2000: You record the GPS position of L 37º 38.9’ N, Lo 67º 56.0’ W in the Deck Log and report this position to the captain. The knotmeter log reads 0703.0. The winds continue to moderate slightly and sea conditions are improving.

• Plot your 2000 GPS position.

C 147

S 6.8

S 7.3

S 8.5


37Nº

38º

39º

36º

35º

37Nº

38º

39º

36º


15º W Var

15º W Var

(ZD +5) (ZD +4)

(ZD +5) (ZD +4)


Time ZT

Course (psc)


Weather Remarks

ZD+5







1730 DR L 37 41.5’ N Lo 68 24.7’ W


Log 0686.0


2000 8.5 GPS L 37º 38.9’ N Lo 67º 56.0’ WWinds moderating, sea conditions improving

Log 0703.0, reported position to captain

2


37Nº

38º

39º

36º

35º

37Nº

38º

39º

36º


15º W Var

15º W Var

(ZD +5) (ZD +4)

(ZD +5) (ZD +4)

See CLS Plot

1730 GPS

WP2

Cape Hatteras Virg

in Rock 058-238º

WP3

WP4


WP1

170400 GPS

C 119 S 6.80800 GPS

C 119 S 6.8

C 176 S 6.8

0910 GPS

0915


1200 GPS

WP5

C 125 S 8.5

1400

1600

1600 GPS

1730

TR 161 SOA 5.5

C 177 S 8.5

1800

2000

2000 GPS

2200

2200 – 720.0

2000 – 703.0

D = 17.0 nm

17. 2200: The knotmeter reading is 0720.0. Winds are at F4, with waves at 3-4 ft.

• Plot your 2200 position.

C 147

S 6.8

S 7.3

S 8.5


37Nº

38º

39º

36º

35º

37Nº

38º

39º

36º


15º W Var

15º W Var

(ZD +5) (ZD +4)

(ZD +5) (ZD +4)


Time ZT

Course (psc)


Weather Remarks

ZD+5







1730 DR L 37 41.5’ N Lo 68 24.7’ W


Log 0686.0




2200 DR L 37º 13.9’ N Lo 67º 59.3’ W Waves F4, waves 3-4ft Log 0720.0

2


37Nº

38º

39º

36º

35º

37Nº

38º

39º

36º


15º W Var

15º W Var

(ZD +5) (ZD +4)

(ZD +5) (ZD +4)

1730 GPS

WP2

Cape Hatteras Virg

in Rock 058-238º

WP3

WP4


WP1

180400 GPS

C 119 S 6.80800 GPS

C 119 S 6.8

C 176 S 6.8

0910 GPS

0915


1200 GPS

WP5

C 125 S 8.5

1400

1600

1600 GPS

1730

TR 161 SOA 5.5

C 177 S 8.5

1800

2000

2000 GPS

2200

2400 GPS 29 Jun 0000 GPS 30 Jun

2400 29 Jun

0000 30 Jun

S 6.8

See CLS Plot

18. 2400: You review the Deck Log, making the 2400 entry. You log the GPS position of L 37º 17.7’ N, Lo 67º 46.8’ W and the knotmeter reading of 0737.0. Winds have dropped to F3 and conditions are continuing to improve. You plot this position on Plotting Sheet #2.

a. If you were to continue your watch beyond 2400, what change would need to be made in the log?

a. _______________________________________________

• Having only caught naps throughout the storm, you turn over the watch, pour yourself a stiff drink, and head to your berth for some well-earned rest.

Start a new page with new dateC

147

S 7.3

S 8.5


37Nº

38º

39º

36º

35º

37Nº

38º

39º

36º


15º W Var

15º W Var

(ZD +5) (ZD +4)

(ZD +5) (ZD +4)


Time ZT

Course (psc)


Weather Remarks

ZD+5







1730 DR L 37 41.5’ N Lo 68 24.7’ W


Log 0686.0




2200 DR L 37º 13.9’ N Lo 67º 59.3’ W Waves F4, waves 3-4ft Log 0720.0

2400 GPS L 37º 17.7’ N Lo 67º 46.8’ W Winds F3, conditions improving Log 0737.0 – watch relieved

J.N. Wanabee, AP

2


37Nº

38º

39º

36º

35º

37Nº

38º

39º

36º


15º W Var

15º W Var

(ZD +5) (ZD +4)

(ZD +5) (ZD +4)

S 7.3

1730 GPS

C 147

WP2

Cape Hatteras Virg

in Rock 058-238º

WP3

WP4


WP1

0400 GPS

C 119 S 6.80800 GPS

C 119 S 6.8

C 176 S 6.8

0910 GPS

0915


1200 GPS

WP5

C 125 S 8.5

1400

1600

1600 GPS

1730

TR 161 SOA 5.5

C 177 S 8.5

1800

2000

2000 GPS

2200

2400 GPS 29 Jun 0000 GPS 30 Jun

2400 29 Jun

0000 30 Jun

S 6.8

See CLS Plot

S 8.5

C 119 S 6.8

0800 DR: L 38º 19.5’ N Lo 69º 18.8’ W

0400 GPS

0800 GPS

CMG 106 SMG 6.8

Set 023 Dft 1.5

0800


13 - 5

8.0

7.0

6.0

5.0

4.0

3.0

2.0

1.0

0.0

0800 GPS

C 176

S 6.8

TR

169

SO

A 5.5

Set 023 Dft 1.5

WP1

WP5

1614 GPS

1634 GPS

CH-VR 058

WP3

1600 GPS

1614 Radar 25.5nm 073

1634 Radar 14.9nm 076

237

24.9

CPA

1600 DR: L 37º 41.5’ N Lo 68º 24.7’ W


13 - 14

8.0

7.0

6.0

5.0

4.0

3.0

2.0

1730 GPS

C 177

S 8.5

TR

161

SO

A 5.5

Set 023 Dft 3.5

UPS Plot

0800 Set/Dft 0800

Vector 0915

SR96a 0915 LOP 1140 MT

1600 Set/Dft 1634 Radar 1730

Vector

Deck Log

What should your cruise packet include?


37Nº

38º

39º

36º

35º

37Nº

38º

39º

36º


15º W Var

15º W Var

(ZD +5) (ZD +4)

(ZD +5) (ZD +4)

FINIREFINIRE

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