legend: blue = information provided. black = calculated

USCG 00217-NP-5 STEPS

1)

SOLUTION:Given:Plot your position and determine from it the depth of water under your keel. Remember, take the depth of the water and subtract your draft of 14 feet. Select a depth of thewater that you estimate it will be based upon sounding around your position.

Red = table values, etc.Green = ANSWER

Blue = information provided.Black = calculated values.

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The following questions are to be answered by using chart 12221TR, Chesapeake Bay Entrance, and the supporting publications.

Your draft is 14 feet (4.2 meters). Use 10° W for variation where required. The gyro error is 3° E.

Deviation Table

Your 1600 position is LAT 37° 22.5' N, LONG 75° 32.3' W. The depth of water under the keel is about __________.

Terrestrial ObservationsChart Plot - Chesapeake Bay Entrance - Operational Level

HDG. MAG.000º 030º060º090º120º

HDG. MAG.180º210º240º270º300º

DEV.2.0º E1.0º E0.0º0.5º W1.0º W

DEV.2.0º W1.0º W0.5º W0.5º E1.5º E

00217-np-5.pdf of 30 © Copyright 2009 - LAPWARE, LLC



LEGEND:

Depth of Water 51'Draft 14'

Depth Under Keel 37'

Select the closest answer.

A) 59 feet (17.3 meters)B) 52 feet (15.8 meters)C) 45 feet (13.6 meters)D) 38 feet (11.5 meters) ANSWER



2)

SOLUTION:Given:Locate Hog Island Lighted Bell Buoy "12" in the Light List - Volume II - Atlantic Coast

68



LEGEND:

If there is no current, what is the course per gyro compass from your 1600 position to point A located 0.5 mile due east of Hog Island Lighted Bell Buoy "12"?


00218-np-5.pdf Page 3 of 30 © Copyright 2009 - LAPWARE, LLC



LEGEND:

Plot your Point "A" position and draw your course line from 1600 to Point "A". Measure theangle of your TRUE heading. Apply Gyro Error to determine your course per gyro compass.

Course True 195.5º TGyro Error 3.0º E

Gyro Course 192.5º pgc


A) 199° pgcB) 196° pgcC) 193° pgc ANSWERD) 190° pgc



3)

SOLUTION:Given:First, lay down your course of 204° true.Second, plot your 1715 position and draw a line from1630 to 1715Third, estimate and plot your 1715 DR position along your 204° course line at 12 knots.

Distance = Speed x Time

Distance = 12 x (45/60)

Distance = 9 miles

Fourth, the direction from your 1715 DR to your 1715 Fix is your SET.Fifth, measure the distance from your 1715 DR to your 1715 Fix. Measure 1.03 miles.Convert this 1.03 miles to speed for one hour.


Speed = Distance / Time

Speed = 1.03 / (45/60)

Speed = 1.37 knots Direction estimated at ENE

See the plot on the next page for validation.


A) 067° T at 1.4 knots ANSWERB) 246° T at 1.0 knotsC) 067° T at 1.0 knotsD) 246° T at 1.4 knots



LEGEND:

At 1630, you reach point A and come right to 204° T. Your engine speed is 12 knots. Your 1715, position is LAT 37° 09.8' N, LONG 75° 37.4' W. The current was __________.





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4)

SOLUTION:Given:

It appears that laying down your course of 214° T at 12 knots is not necessary to solvethis question. However, it might be required for a future question.Plot your position after converting all pgc bearings to true bearings.

Chesapeake Light 175º pgcGyro Error 3 E

True Bearing 178º T

Cape Henry Light 239º pgcGyro Error 3 E


Cape Charles Light 293º pgcGyro Error 3 E


Lay down your true bearings and determine your Latitude and Longitude of your1800 position.



LEGEND:

From your 1715 fix, you steer 214° T at 12 knots. At 1800, you take the following bearings:

Chesapeake Light bearing 175° pgc Cape Henry Light bearing 239° pgc Cape Charles Light bearing 293° pgc

Your 1800 position is __________.





LEGEND:

37° 02.9' N75° 43.1' W


A) LAT 37° 02.7' N, LONG 75° 42.7' WB) LAT 37° 02.9' N, LONG 75° 43.1' W ANSWERC) LAT 37° 03.0' N, LONG 75° 43.3' WD) LAT 37° 03.1' N, LONG 75° 42.8' W



5)

SOLUTION:Given:Plot your 1815 position, determine your destination and then figure out yourcoure to steer true. Apply variation and deviation to determine the heading psc.

247.0° T

True Heading 247.0º TVariation 10.0º WMagnetic 257.0ºDeviation 0.0ºCompass 257.0º Psc


A) 257.0° ANSWERB) 255.5°C) 251.0°D) 249.0°

At 1815, your position is LAT 37° 01.0' N, LONG 75° 42.7' W. If there is no current, what is the course per standard magnetic compass to arrive at a point 0.3 mile due north of North Chesapeake Entrance Lighted Whistle Buoy "NCA" (LL#375)?



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6)

SOLUTION:Given:You must first solve for the Course To Steer (CTS) allowing for the current using yourmaneuvering board. Lay down the Course to Steer. Measure your distance to runto the point where you will cross into the red sector of Cape Henry Light. Using thisdistance to run and your speed made good determine your ETA at this interesection.

From your 1815 position, you want to make good a course of 263° T. Your engines are turning RPM's for 12 knots. The current is 050° T at 1.9 knots. Adjusting your course for set and drift, at what time should you expect to enter the red sector of Cape Henry Light?



LEGEND:


050° T

Speed turning 12 knots arc

Course to Make Course to Steer is

You are asked to solve for your Course to Make Good (CMG) allowing for the current that will affect you while turning 12 knots. From the center of the plot, lay down your desired course as determined on the chart plot. From the center of the plot, draw you current which you will allow for. From the END of the current line swing an arc of 12 knots (your engine speed turning). Where this arc intersects your desired Course to Make Good, paralleled to the center of the plot will be you Course To Steer. Your Speed Made Good (SMG) is measured from the center of the plot to the intersection of your original Course to Make Good. This speed, although NOT asked for, will be needed to calculate your ETA.

SPEED MADE GOOD




LEGEND:

Course to Make Good 263ºCourse to Steer 258º

Speed Made Good 10.4 kts.

Measure your distance along your Course to Make Good and calculate your ETAat a speed of 10.4 knots from your 1815 position.

Distance to run is 8.3 miles


Time = Distance / Speed

Time = 8.3 / 10.4

Time = 0.80 hours

Time = 48 minutes

181548

1903




LEGEND:

1903


A) 1904 ANSWERB) 1859C) 1854D) 1849




LEGEND:

a = b = cSin A Sin B Sin C

C

B A = 263° to 050° =360° - 263° = 97°

12 = 1.9Sin 147° Sin B

Sin B =

Sin B = 1.034814212

Sin B = 0.0862345263°

B = 4.9º - 4.9°Course To Steer 257.9°

Angle C = 180° - (147° + 4.9°) = 28.1°

NOW, you must calculate your Speed Made Good. You areturning 12 knots BUT you are NOT making good 12 knots!

12 = cSin 147° Sin 28.1°

c =

c = 5.65214260.544639

c = 10.4 kts. SPEED MADE GOOD

Sin 147°

LAW OF SINE

1.9 x Sin 147°12

147°

12 x Sin 28.1°

050° T1.9 kts

Speed turning 12 knot arc

Course to Make Good is 263°



7)

SOLUTION:Given:Determine your TRUE bearings on both lights. Plot them on the chart and thendetermine your relative bearing to Chesapeake Light (relative to your heading).

Cape Henry Light 225º PgcGyro Error 3º E


Chesapeake Channel Tunnel N Light 288º PgcGyro Error 3º E


Heading 268º T

The information below is all that is provided in the Light List on the Tunnel North Light.Make sure you lay the bearing down from the correct light on the North Tunnel.

At 1920, Cape Henry Light bears 225° pgc, and Chesapeake Channel Tunnel North Light bears 288° pgc. If your heading is 268° T, what is the relative bearing of Chesapeake Light?



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LEGEND:

With both bearings laid down fpr you 1920 position, plot your course of 268° T.Plot a line from your 1920 Fix to Chesapeake Light.From your heading, using your triangles or parallel ruler, determine the relative bearingto Chesapeake Light.




LEGEND:

The relative bearing is 33° from dead astern off your port quarter.That's 180° + 33° = 213° Relative.




LEGEND:


A) 206°B) 213° ANSWERC) 215°D) 220°



8)

SOLUTION:Given:Look at your 1920 position and determine which is the best answer.

See the next page for answers

A)

B) CORRECT - Restricted area - see Note AC) INCORRECT - See Note G - You are NOT in any traffice separation scheme.D) INCORRECT - See Note in Lower Left corner of the chart


A) You are governed by the Inland Rules of the Road.B) You are entering a restricted area. ANSWERC) You are within the Chesapeake Bay Entrance traffic separation scheme.D) You can expect differences of as much as 6° from the normal magnetic variation of

the area.

INCORRECT - See COLREGS note and note in lower left corner of screen above. Trace the light green line and you will see that you are in International Waters.

Which statement concerning your 1920 position is TRUE?



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9)

SOLUTION:Given:

Lay down your course line from your 1920 position to a point between buoys9 and 10. You should get approximately 274° T. Now convert it to a compassheading (psc) by applying variation and deviation.

Course True 274º TVariation 10º WMagnetic 284ºDeviation 1º ECompass 283º Psc


A) 274° pscB) 280° pscC) 283° psc ANSWERD) 286° psc

From your 1920 position, you change course to enter Chesapeake Channel between buoys 9 and 10. What is the course per standard magnetic compass (psc)?



LEGEND:




10)

SOLUTION:Given:Plot your 2000 position.Plot your 2037 bearings. First convert the pgc bearings to true bearings.Determine the course made good from 2000 to 2037.

Old Plantation Flats Light 033º G York Spit Light 282º GGyro Error 3º E Gyro Error 3º E

True Bearing 036º T True Bearing 285º T

Refer to the Light List to verify the location of the lights that were observed.

Page 370

Page 374

At 2000, your position is LAT 37° 04.1' N, LONG 76° 05.6' W. You change course for the Eastern Shore. At 2037, Old Plantation Flats Light bears 033° pgc, and York Spit Light bears 282° pgc. The course made good from your 2000 position is __________.



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LEGEND:

359.5° TSelect the closest answer.

A) 020° TB) 014° TC) 006° TD) 359° T ANSWER



11)

SOLUTION:Given:Presently, there is no need to plot your course on the chart BUT it might be neededto solve a future question.

Course to Make Good 016º TLeeway 3º Westerly - Steer into the wind or to the LEFT

Course to Steer 013º TVariation 10º WMagnetic 023ºDeviation 1º ECompass 022º Psc


A) 022° psc ANSWERB) 025° pscC) 028° pscD) 031° psc

At 2037, you change course to make good a course of 016° T. There is no current, but a westerly wind is causing 3° leeway. What course per standard magnetic compass (psc) should you steer to make good the course 016° T?



LEGEND:




12)

SOLUTION:Given:Using the Luminous Range diagram and solve this problem.

Wolf Trap Light Range as listed on the chart is 11.0 milesWolf Trap Light Range as listed in the Light List is 11.0 milesHeight of eye is just a distracter.

Page 374

Your height of eye is 25 feet (7.6 meters). If the visibility is 5.5 nautical miles, what is the luminous range of Wolf Trap Light?



LEGEND:





LEGEND:

Range 11 miles7.4 miles


A) 17.0 milesB) 16.0 milesC) 12.0 milesD) 7.5 miles ANSWER



13)

SOLUTION:Given:In question 6 you were turning RPMs to make 12 knots. We must assume thatyou are still turning for 12 knots since no other change of speed has been provided.Using 12 knots, determine your 2115 DR position. Then determine which chartis the best one to use from those offered.


Distance = 12 x (2115 - 2037)/60

Distance = 7.6 miles

If you want a more detailed chart of the area at your 2115 DR position, which chart should you use?



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LEGEND:


A) 12238B) 12225C) 12224 ANSWERD) 12222

Chart 12224



14)

SOLUTION:Given:Plot your 2123 position and measure your distance off of Savage Neck.You should get about 1.68 miles


A) 1.7 miles ANSWERB) 2.6 milesC) 3.4 milesD) 4.6 miles

1.68 miles

At 2123, your position is LAT 37° 20.0' N, LONG 76° 03.0' W. What is your distance offshore of Savage Neck?



LEGEND:




15)

SOLUTION:Given:


Time = Distance / Speed

Time = 42 / 13

Time = 3.23 hours

Time = 3h 14m

2123314

0037


A) 0148B) 0112C) 0037 ANSWERD) 2359

From your 2123 position, you are approximately 42 miles from Crisfield, MD. If you are making good a speed of 13 knots, at what time should you arrive at Crisfield, MD?



LEGEND:



legend: blue = information provided. black = calculated

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