NAV JULY A

8/13/2019 NAV JULY A

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1. What do you cal l the per iod taken by

the moon to go to al l phases?

A. Lunation

B. Lunar eclipse

C. Lunar cycle

D. Lunar oscillation


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2. The relat ive narrow extension of any

ant icyclone or h igh p ressure area

particu lar ly one connect ing two ant icyclones is called:

A. Isobar

B. TroughC. Ridge

D. Edge


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3. Solu t ion :

GHA= ?

SHA = 10931.8

GHA = 22517.2

SHA = 109 31.8 ( - )

GHA = 11545.4


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4. This is an in strument used in

measu r ing the hum idi ty o f the air

cons is t ing of a dry and wet bulbthermometer.

A. Barograph

B. ThermographC. Hydrometer

D. Hygrometer


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SLING HYGROMETER


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DIGITAL HYGROMETER


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5. Find the true bear ing i f the compass

reads 296, variat ion is 6 W and deviat ionis 12 E.

A. 302

B. 314

C. 278D. 290


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5. Solu t ion

C/ = 296

Dev. = 12E ( + )M/ = 308

Var. = 6W ( - )

T/ = 302


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6. The direct ion o f one terrestr ial poin t

f rom ano ther exp ressed as angular

distance from a reference direct ionusual ly 000 clockw ise through 360.

A. Bearing

B. AzimuthC. Course

D. Heading


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AZIMUTH = The horizontal direction or bearing of

a celest ial po int from a terrestr ial po int,

expressed as the angular distance from a reference

direction measured from 000 clockwise to 360.

COURSE = The direct ion in w /c a vessel is

steered o r intended to be steeredexpressed as

angular distance from north usually from 000clockwise / counterclockwise through 360

HEADING = The horizontal di rect ion in w/c ship

usually po ints or heads at any instant, expressed

in angular units from 000 clockwise to 360


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7. If the decl inat ion of the sun is 0, whatdo you cal l the pos i t ion or poin t on the

celest ial sphere?A. Solstice

B. Apogee

C. Equinox

D. Perihelion


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http://upload.wikimedia.org/wikipedia/commons/d/de/Ecliptic_path.jpg


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http://upload.wikimedia.org/wikipedia/commons/d/de/Ecliptic_path.jpg


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8. The bel t of h igh pressu re extending

around 35 N is cal led:A. DoldrumsB. Horse latitude

C. Prevailing Westerlies

D. Trades


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9.If lat itud e and decl inat ion are equal and

the same name, what is the alt i tude o f the

body at mer id ian transi t?A. 0

B. 90

C. 180D. 45


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10. What are the two p lanets that are

nearest to the earth?

A. Venus and MarsB. Mars and Saturn

C. Jupiter and Saturn

D. Mercury and Venus


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11. What is the usual sequence o f

d i rect ion o f tropical revolv ing storm in

the sou thern hem isphere?A. Northwest, West hence South

B. Southwest, South hence Southeast

C. North, Northwest hence EastD. West, Northwest hence North


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12. What is the angle o f observat ion

between true no rth as a reference poin t

measu red c lockw ise to the direct ion o fthe ob ject being measu red?

A. Compass bearing

B. Magnetic bearingC. True bearing

D. Geographic bearing


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13. A vessel at Lat 32 14.7 N, Long 6628.9 W heads for a destination at Lat 3658.7 N, Long 75 42.2 W. Determine thecourse and distance by Mercator sai ling .A. 058.2T, 241.2 miles

B. 235.2T, 270.2 milesC. 301.8T, 538.2 miles

D. 348.3T, 300.2 miles


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Lat 1 = 3214.7 N

Lat 2 = 3658.7 N

Dlat = 04 44.0 N

x 60

Dlat = 284

Long 1= 6628.9 WLong 2= 7542.2 W

Dlong = 0913.3 W

x 60Dlong = 553.3

RULES FOR DLAT

Lat same name ( - )

Lat di ff name ( + )

RULES FOR LONGITUDE

SAME NAME ( - )

DIFF NAME ( + )

IF DLO IS > 180 THEREFOREDLO = 360 - Dlo

H t i id i l t b l l t


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How to acqu i re mer id ional parts by calculator

MP = Lat / 2 + 45 = Tan log x 7915.7Lat sin

x 23.3

MP1 = 2033.31

MP2 = 2376.98 ( - )

DMP = 343.67

Tan co = Dlo / DMP

= 553.3 / 343.67

= 1.60997 inv. Tan

Co < = N 5809 W

360- 5809

T / Co . = 30151

RULES FOR DMPLAT SAME NAME ( - )

LAT DIFF NAME ( + )


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Dist. = Dlat / Cos Co.

= 284 / Cos 58 09

= 284 / 0.527697

Dis t. = 538.2 nm


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14. What is the reference in determ ining

the sidereal t ime?

A. SolsticeB. Meridian angle

C. Equinox

D. First Point Aries


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15. You depart Lat 18 54 N, Long 73 00E, and s team 1,150 m iles on course 253T. What are the lat i tude and longitude o fyour arr ival by Mercator Sai l ing ?

A. Lat 1316N, Long 5818E

B. Lat 1318N, Long 5403EC. Lat 1319N, Long 5346E

D. Lat 1320N, Long 5328E


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15. Solu t ion:

Dlat = Dist x Cos co.

= 1,150 x Cos 253/ 73

= 1150 x 0.29237

= 336.22 / 60

Dlat = 0536 S

Lat 1 = 1854 N(-)

Lat 2 = 1318 N

MP1 = 1147.59

MP2 = 799.90 ( - )

DMP = 347.69


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RULES FOR LAT 2

Same name ( + )

Diff name ( - )

Dlo = Tan co. x DMP

= Tan 73x 347.69

= 3.27085 x 347.69

= 1137.2 / 60

Dlo = 1857 W

Long 1 = 73 00 E( - )

Long 2 = 5403 E

RULES FOR LONG. 2

SAME NAME ( + )

DIFF NAME ( - )


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16. What publ icat ion contains ocean

cu rrent informat ion for voyage plann ing

from San Francisco to Tokyo?A. World Port Index

B. Sailing Direction

C. Guide to Port EntryD. Coast Pilot


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17. The extreme dis tance in wh ich a

prom inent object can be seen by unaided

eye is called :A. Extreme distance

B. Distance of eyesight

C. VisibilityD. Recorded distance


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18. You depart Lat 38 14 N, Long 1242 W, for Lat 38 14 N, Long 46 09 W.What are the course and distance?A. 090T, 1,576.5 miles

B. 090T, 2,879.0 miles

C. 270T, 1,576.5 milesD. 270T, 2,868.5 miles


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18. Solu t ion :

Long 1 = 1242 W

Long 2 = 4609 W

Dlo = 3327 W

x 60

Dlo = 2007

DLO = DIST / COS LAT.

DIST = DLO x COS LAT

= 2007 x Cos 38 14= 2007 x 0.785496

DIST = 1,576 NM


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19. When consider ing currents to use in

coastal navigat ion , what amount o f

cu rrent is prudent to use?A. The least

B. Minimum

C. MaximumD. None


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20. The warm dry air blow ing down the

leeward s ide of the moun tain slopes to

the val ley o r p lain is cal led :A. Foehn wind

B. Fall wind

C. Anabatic windD. Katabatic wind


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21. Where is the body when i ts LHA and

merid ian ang le are zero?

A. At sunriseB. At meridian passage

C. At sunset

D. At the prime vertical


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22. You depart Lat 15 48 N, Long 17406 E and steam 905 miles on course

090 T. What is the longi tude of arr ival?A. 16541W

B. 17013W

C. 17247WD. 17906E


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22. So lut ion:

Dlo = Dist / Cos Lat

= 905 nm / Cos 1548 N= 940.5 / 60

Dlo = 1540 E

Long 1 = 17406 E ( + )

= 18946 - 360 ( Dlo > 360 )

Long 2 = 17014 W


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23. What do you cal l the condi t ion at

which the gyroscope dev ices should be

insens i t ive to app l ied accelerat ion?A. Law of inertia

B. Archimedes

C. Schuller tunedD. None of these


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24. Wh ich publ icat ion is needed when

enter ing a foreign po rt and you requ ire

pi lot services?A. Sailing direction

B. World port index

C. Coast pilotD. Pilot chart


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25. What is the term used to the apparent

increase in the sem idiameter of a

celest ial body as its alt itud e inc reases dueto reduced d istance from the observer?

A. Augmentation

B. RefractionC. Parallax

D. Dip

AUGMENTATION


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AUGMENTATIONAPPARENT INCREASE IN SEMIDIAMETER OF CELESTIAL BODY AS ALTITUDE

INCREASES.

SEMI - DIAMETER

REFRACTION


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Parallax - the difference in direction of a

celestial object as seen by an observer from

two widely separated points. Themeasurement of parallax is used directly to

find the distance of the body from the Earth

(geocentric parallax) and from the Sun

(heliocentric parallax). The two positions of the

observer and the position of the object form a

triangle.
http://upload.wikimedia.org/wikipedia/commons/9/97/VenusTransitVermeer.png


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GEOCENTRICPARALLAX

HELIOCENTRIC

PARALLAX
http://upload.wikimedia.org/wikipedia/commons/9/97/VenusTransitVermeer.pnghttp://upload.wikimedia.org/wikipedia/commons/9/97/VenusTransitVermeer.pnghttp://upload.wikimedia.org/wikipedia/commons/9/97/VenusTransitVermeer.pnghttp://upload.wikimedia.org/wikipedia/commons/9/97/VenusTransitVermeer.png


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26. What do you cal l the curve that

passes th rough places at zero d ip and no

inc l inat ion on the compass needle?A. Magnetic meridian

B. Magnetic equator

C. Magnetic fieldD. Magnetic north

27 Wh t i th l h i h


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27. What is the p lane wh ich passes

through the observers eye and at right

ang les to the vert ical of the observer?A. Celestial horizon

B. Sensible horizon

C. Visible horizonD. Geoidal horizon

28 Find the lat i tude o f the observer i f the


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28. Find the lat i tude o f the observer i f theal t itude of the body at upper trans i t is 5009.8 bearing south and the declination is18 17.6 N.A. 3152.2N

B. 4107.8N

C. 2132.6ND. 5807.8N

28 Solu t ion :


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28. Solu t ion :

H.O. = 5009.8 S * HO & ZX are always *

( - ) 9000.0 contrary name

ZX = 3950.2 N

DEC= 1817.6 N

LAT = 5807.8 N

RULES FOR OBS. LAT

1.Add if ZX & DEC same name

LAT will take the name of ZX & DEC.2. Subtractif ZX & DEC diff name

LAT will take the name of greater value


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29. What is the color of the ligh t of an

isolated danger mark?

A. RedB. White

C. Yellow

D. Green

30 The ang lar dis tance of celest ial bod


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30. The angular dis tance of celest ial body

measu red eastward from the fi rs t po int of

A r ies is cal led:A. RA

B. LHA

C. GHAD. SHA

31 Th i h l f h i


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31. The azimu th angle o f the sun is

measu red from:

A. ZenithB. Elevated pole

C. First point of Aries

D. Greenwich meridian

32 Determ ine the great circle dis tance


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32. Determ ine the great circle dis tance

and ini t ial course from Lat 34 51.0 N,Long 115 01.2 E to Lat 10 16.0 S, Long51 42.6 E.

A. 4,436 miles, 245.3T

B. 4,598 miles, 245.6TC. 4,493 miles, 245.6T

D. 4,582 miles, 245 3T

32 Solu t ion :


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32. Solu t ion :

Long 1= 11501.2 E RULES FOR DLO

Long 2= 5142.6 E Long same name ( - )

Dlong = 6318.6 W Long diff name ( + )

Cos Dist. = ( Cos Lat 1 x Cos Lat 2 x Cos Dlo )+/- ( Sin Lat 1 x Sin Lat 2 )

= ( Cos 3451 x Cos 1016 x Cos 6318.6 )

( Sin 3451 x Sin 1016 )

= 0.362740.10184 RULES FOR GCD


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= 0.2609 inv. Cos Lat same name ( +)

= 74.87 or 7452.7 Lat diff name ( - )

x 60GCD = 4492.7 nm

Sin I. C. = ( - ) Cos Lat 2 x Sin DloSin Dist.

= - Cos 1016 x Sin 6318.6'

Sin 7452.7'

Note : Make L2 negative when crossing Equator

Initial Course is labeled same as Lat 2 and

same name as Dlo

Sin I C = - 0 98398 x 0 89344


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Sin I. C. = - 0.98398 x 0.893440.96537

= - 0.910663 inv Sin ( Use +/- to eliminate)

Co < = S 65.6W

(+) 180 ( 3rdQuadrant )

T/ Co . = 245.6

33 The boundary between two air


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33. The boundary between two air

masses is cal led:

A. Pressure gradientB. Isobars

C. Isotherm

D. Front


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FRONTFRONT

34 What is th e po int in the ecl ip t ic that


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34. What is the po int in the ecl ip t ic that

is 90away from the equ inox?

A. SolsticeB. Azimuth

C. Zenith

D. Nadir


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35 What is the co lor o f conical buoy


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35. What is the co lor o f conical buoy

under IALA A?

A. RedB. Yellow

C. Green

D. Black

36 This is the half of the storm which


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36. This is the half of the storm which

l ies to the lef t of the path in the North

hemisphere and to the right o f the pathin the Sou th hem isphere.

A. Dangerous semicircle

B. Navigable semicircleC. Dangerous quadrant

D. Storm track


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37 In the daily page o f the nautical


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37. In the daily page o f the nautical

almanac, the unshaded c irc le in the

lower r ight hand corner means :A. Full moon

B. New moon

C. Gibbous moonD. Quarter moon

38 What is the zen ith d istance o f the sun


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38. What is the zen ith d istance o f the sun

at theoret ical sunr ise and sunset?

A. 108B. 102

C. 90

D. 96

39 The s tandard atmospher ic pressu re


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39. The s tandard atmospher ic pressu re

in inches of mercury is :

A. 28.27

B. 29.92

C. 28.70

D. 29.29

40 What is the app rox imate maximum


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40. What is the app rox imate maximum

rel iable ground wave range of LORAN

C?A. 600 miles

B. 1,200 miles

C. 900 milesD. 2,300 miles

41. Find the GHA of A r ies from the


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41. Find the GHA of A ries from the

fol low ing : GHA of the star 312 17.6,SHA of s tar 257

26.8.

A. 20950.8

B. 05444.4

C. 05450.8D. 20944.4

41. Solu t ion :


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41. Solu t ion :

GHA = ?

SHA= 25720.8

GHA = 31217.6

SHA = 25720.8(-)

GHA = 05450.8'

42 Convert 041 39 8 into time


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42. Convert 041 39.8 into time.A. 02H 52M 12S

B. 01H 54M 35SC. 03H 03M 45S

D. 02H 46M 39S

43. Convert 03H 45M 51S in to long itude.


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43. Convert 03H 45M 51S in to long itude.

A. 056 58.9

B. 056 27.8C. 055 34.9

D. 057 14.6

44. A t the master gy rocompass, the


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44. A t the master gy rocompass, the

compass card is at tached to the:

A. Spider elementB. Sensitive element

C. Link arm

D. Pick up transformer

45. What causes the w ind f low from ho rse


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lat itude to the doldrums to def lect?

A. Prevailing westerliesB. Semipermanent high

C. Coriolis force

D. Pressure gradient force

46. It is made of so ft un-magnetized iron


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g

p laced vert ical ly near a magnetic

compass to counteract deviat ion :

A. Fore and aft magnet

B. Heeling magnet

C. Vertical magnetD. Flinders bar

47. Wh ich o f the fol low ing cannot be seen


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g

in the left hand page of the naut ical

almanac?

A. GHA of Aries

B. GHA of Sun

C. GHA of MarsD. GHA of Venus

48 What is the apparent path b y which


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48. What is the apparent path b y which

the planets revo lve around the sun?

A. EclipticB. Orbit

C. Axis

D. Diurnal circle

49. The dif ference between the


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geograph ic mer id ian and the magnet ic

merid ian is cal led :

A. Compass error

B. Deviation

C. VariationD. Dip

50. What is the arc o f the hour circ le


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between the celest ial pole and a po int in

the celest ial sphere?

A. Declination

B. Altitude

C. Zenith distanceD. Polar distance

51 One of the advantage of gyro


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51. One of the advantage of gyro

compass over a magnetic compass is :

A. Accuracy is not affected by latitudeB. It is run by electric power

C. Easy to maintain and repair

D. Performance is not affected by magnetic

fields

52 An observer aboard a vessel


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52 An observer aboard a vessel

pro ceeding th ru st i l l air w i l l exper ience

an apparent w ind from dead ahead hasan apparent speed o f 18 kno ts. This is

equal to the:

A. Speed of cloud movements

B. Speed of the waves the ship is meeting

C. Speed of the ship

D. Speed of sound

53. If you transfer a straigh t l ine on


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Mercator chart to a globe, what wi l l i t look

l ike?

A. As a straight line also

B. Curve line having a convexity towards

the equatorC. Curve line having a convexity towards

the nearest pole

D. As an irregular line

54. There are standard lettering used in


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Nautical charts. A leaning type of letter ing

is used for :

A. Water, underwater and floating features

B. Islets

C. LighthouseD. Rocks

55. If all these landmarks charted wh ich


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of these is less reliable?

A. IslandB. Lighthouse

C. Buoy

D. Mountain peak

56. You are on course 303 T. To check


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the speed of your vessel you should

observed a celest ial body on which

bear ing?

A. 000

B. 213

C. 090

D. 123

57. In m easu r ing distance from any


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navigat ional chart w ith the aid o f a

div ider, the measu rement is always

taken from the lat i tude scale at the side

margins of the chart because:

A. Ready accessibility

B. Accuracy/Minimum distortion

C. Expanded meridional parts

D. Equal distances

58. What t ide occu rs when the moon is


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at f i rst quarter and third quarter phase?

A. ApogeanB. Perigean

C. Neap

D. Spring

59. What region o f the earth canno t be


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59. What region o f the earth canno t be

reproduced accu rately in a Mercator

Chart?A. The Atlantic

B. The Polar region

C. The Equatorial regionD. The Amazon River Delta

60. A chart covering a large area is


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cal led smallscale chart and a chart

co vering a small area is large-scale.

Wh ich of the fol low ing is large-scale

chart?

A. 1:100,000

B. 1: 25,000

C. 1:1,000,000

D. 1: 50,000

61. The dif ference between the direct ion s


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of an object when i t is v iewed from two

places is:A. Asteroids

B. Reflection

C. ParallaxD. Refraction

62. The apparent d iurnal mot ions of the


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heavens is due to:

A. Orbit of the earth around the sunB. Advance of the earth in its orbit

C. Rotation of the earth

D. Revolution of the moon around the earth

63. You are steam ing on a course of 253T


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at 14 kno ts . A t 2329 Hrs ., you observe a

ligh thouse bearings 282 T. A t 2345 Hrs .,the l igh thouse bears 300 T. What is your

distance off at the second bear ing?

A. 5.2 miles

B. 4.3 miles

C. 3.7 miles

D. 5.9 miles

63. Solu t ion :

BEARING AT ANY ANY ANGLE


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BEARING AT ANY ANY ANGLE

Co = 253 Co. = 253 < b = 47

1st = 282(-) 2nd = 300(-) < a = 29(-)< a = 29 < b = 47 ( b- a ) = 18

AB = Dist Run BC = Dist 2nd

AC = Dist 1st

CD = Dist Abeam


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BC = AB x Sin a

Sin ( a-b )BC = 3.73 x Sin 29

Sin 18

BC = 1.80833

0.30901

BC = 5.85 nm

64. The l ine in the chart connect ing


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soundings of equal depth is called?

A. Agonic lineB. Contour

C. Seismographic line

D. Isothach

65. Compass error caused by hor izontal


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so f t irons on board and ho r izon tal force

by the earth :

A. Quadrantal deviation

B. Magnetic field

C. Semi circular deviationD. Magnetic polarity

66. Your ship is enter ing po rt from the


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sea, and you sigh t a pair o f range l ights .

When in line, they bear 315 per s tandard

magnet ic compass. The chart shows that

the range bearin g is 312 T, and the

variat ion is 6 W. What is the deviat ion o f

your compass at the t ime of the sigh t ing?

A. 9 E

B. 3 W

C. 3 E

D. 9 W

66. Solu t ion :


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T/ = 312

Var. = + 6W

M/ = 318

Dev. = 3E

C/ = 315

67. The property of the gyroscope which


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cause i t to maintain i ts plane of ro tat ion

is the:A. Torque

B. Precession

C. RigidityD. Spin

68. When the sun is at perihelion , what

i l l b i li i W h i t


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season w i l l be prevai ling in Wash ing ton ,

D.C. and other c i t ies in No rth America?

A. Summer

B. Autumn

C. SpringD. Winter

69. The ro l l ing motion o f a vessel that

i t d t th


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can introdu ce an error to the

gy rocompass is called:

A. Gimballing error

B. Damping error

C. Ballistic deflection errorD. Quadrantal

70. A ship runs at a speed of 8 knots .

H l i l l i t t k h t di t


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How long w i l l i t take her to run a distance

of 1 m ile?

A. 7.5 minutes

B. 4.8 minutes

C. 5 minutesD. 8.0 minutes

70. Given:


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Speed = 8 knots

Distance = 1 mileFind : Steaming Time

Dist = speed x time

Time = Dist / SpeedTime = 1 nm / 8 knots x 60 minutes

Time = 0.125 x 60 mins.

Time = 7.5 m inu tes

71. During new moon, i ts upper trans i t

t


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occu rs at :

A. 6 amB. Midnight

C. 6 pm

D. Noon

72. What celest ial body may be seen at

lower transit with an altitude of 32 48 to


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lower transit with an altitude of 32 48 to

an observer in Lat. 47 52 N. The body

shou ld have a decl inat ion o f:

A. 09 20N

B. 74 56N

C. 81 00N

D. 74 52N

72. Given:

Alt. 32 48, Lat. 47 52 N


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Alt. 32 48 , Lat. 47 52 N

Find : Dec of body at Lower Transit

HO = 3248+ 9000'

12248

Lat = 4752 N (-)

Dec = 7456 N

Rules for Circum po lar bod y

If Lat and Dec are same name but

Dec > Lat, therefore HO + 90.

73. When a vessel en ters a por t , what is


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the shape of a buoy you w i ll see on the

starboard side?A. Cylindrical

B. Conical

C. SparD. Spherical

74. The force that wi l l cause the axis o f a

spinn ing gyroscope to turn in a direct ion


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sp inn ing gyroscope to turn in a direct ion

90 away fo r fo rce is :

A. Friction

B. Precession

C. TorqueD. Rigidity

75. Index erro r w i l l be found tabu lated in

the Naut ical A lmanac:


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the Naut ical A lmanac:

A. False

B. True

C. Cannot be determined

D. None of these

76. Charts w ith a scale of 1:50,000 are

used fo r navigation and ancho r ing in


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used fo r navigation and ancho r ing in

harbors and small waterways . These are

classi f ied as:

A. Harbor charts

B. General charts

C. Bay charts

D. Coast charts

77. A l ine of pos i t ion der ived from a

loran reading is a sect ion o f a (n):


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loran reading is a sect ion o f a (n):

A. Parabola

B. Arc

C. Straight line

D. Hyperbola

78. Wh ich of the fol low ing l is ted in the


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in format ion is not in the Ligh t Lis t?

A. Description of the lighthouseB. Characteristics of the light

C. Position of the lighthouse

D. Vertical and danger angles

79. An ex-merid ian s igh t is to be taken

h th b d i


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when the body is :

A. At lower transitB. Within 28 minutes of meridian passage

C. Exactly transiting the meridian

D. Is not visible

80. Side ad jacent/hypotenuse is known

as:


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as:

A. Cot A

B. Cos A

C. Sec A

D. Sin A

81. Charts w ith a scale of 1:600,000 are

used for p lann ing f ix ing posi t ion s at


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used for p lann ing, f ix ing posi t ion s at

sea, plo t t ing dead reckoning whi le

proceeding on a long voyage, show ing

navigat ional l ights , ou ter buoys and

landmarks is c lass i f ied as:

A. General charts

B. Coast charts

C. Sailing charts

D. Pilot charts

A.

82. What current changes speed in

di rect ion cycl ical ly on somewhat


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direct ion cycl ical ly on somewhat

regu lar in tervals, as a t idal cu rrent?

A. Seasonal current

B. Drift current

C. Surface currentD. Periodic current

83. The sea level o f the sea is affected

by a strong offsho re w ind The water


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by a strong offsho re w ind . The water

level of the sea w il l be:

A. Higher than normal

B. Double the level the normal

C. Not be affected very muchD. Lower than normal

84. A right angle plane tr iangle ABC,

righ t ang le at C ang le A = 5845 find


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righ t ang le at C, ang le A = 58 45, find

ang le B?

A. 31 05

B. 31 15

C. 31 55D. 31 25

85. Compass erro r is equal to the:

A D i ti i i ti


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A. Deviation minus variation

B. Variation plus compass courseC. Algebraic sum of the variation and

deviation

D. Difference between true and magnetic

compass

86. A t new moon, the sun and the moon

are in and the h igh t ide


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are in __________ and the h igh t ide

oc cu rr ing is cal led _______ tides:

A. Quadrature-Neap

B. Conjunction-Neap

C. Conjunction-SpringD. Opposition-Spring

87. It is desired to make a good course

o f 185 T and a speed o f 12 kno ts


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o f 185 T, and a speed o f 12 kno ts,through a current which sets 300 T,dr i f t 3 kno ts. What is the speed to run?

A. 13.5 knots

B. 13.8 knots

C. 14.5 knots

D. 12.0 knots

88. You r ship is s teering 330 T at 17knots The wind appears to b low from


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knots. The wind appears to b low from

the East at Beau fo rt fo rce 5 (18 kno ts ).

What is the direct ion o f the true w ind?

A. 085

B. 119

C. 100

D. 148

89. When we say the sun is at perihelion ,i t means that the earth is:


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A. At the point when the earth is midway

between the sun and the moon.

B. Farthest from the sun

C. Nearest the sun

D. The point when the moons navigational

pull is the strongest and draws back on

her circular orbit around the sun.

90. The heigh t o f a l igh thouse featu red

in a Naut ical chart is measu red from


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in a Naut ical chart is measu red from

what level as the reference po int?

A. Mean sea level

B. Mean low water

C. Mean high waterD. Mean lower low water

91. Tropic t ide occu rs when:

A The moon is at maximum semi monthly


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A. The moon is at maximum semi monthly

declinationB. Moon is at perigee

C. Sun and moon are both near 0declination

D. Moon is crossing at equator

92.The horizontal movement o f water


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towards the land is:

A. Ebb currentB. Flood current

C. High tide

D. Eddies

93. What instrument is used to measu re

the water content of the atmosphere?


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the water content of the atmosphere?

A. PsychrometerB. Rain gauge

C. Thermometer

D. Thermograph

94. A fter you have computed the In i t ial

Cou rse in a g reat c i rc le sail ing rou te


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Course in a g reat circ le sail ing rou te

across the Paci f ic Ocean going to

Seatt le, Washing ton can th is cou rse bemaintained unt i l you reach your

dest inat ion?

A. Yes

B. Maybe

C. No

D. Definitely yes

95. When the sun is said to be at theVernal Equ inox, i t means that sun is


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direct ly above the equator. The sun is

crossing the equator from :A. The southern hemisphere to the northern

hemisphere

B. Moving obliquely southeast towards thetropic of cancer

C. Moving obliquely northwest due to the

inclination of the eclipticD. The northern hemisphere to the southern

hemisphere

96. A celest ial body w ith an azimuth o f

270 w i l l g ive a LOP that determ ines your :


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270 w il l give a LOP that determ ines your:A. LongitudeB. Latitude

C. Polar distance

D. Zenith distance

97. The heigh t of t ide is the:

A Vertical distance from the tidal datum to the


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A. Vertical distance from the tidal datum to the

level of the waterB. Depth of water at a specific time due to

tidal effect.

C. Difference between the depth of the waterand the high water tidal level.

D. Difference between the depth of the water

at high and at low tide.

98. How may the poss ibi l i ty of

encounter ing gales be determ ined from Pilot


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g g

Chart?

A. Listening to the radio weather broadcasts

and cross checking with the chart.

B. Noting the prevailing wind force and

direction for the area in question.

C. Noting the bathymetric curves

D. Read the weather report from the dailynewspapers and compare with the chart.

99. What tide is characterized by a large

inequal ity in the heigh ts of h igh water


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q y g g

and low water heigh ts?

A. Mixed

B. Semidiurnal

C. Diurnal

D. Solar

100. What condit ions make a celest ial

body c i rcumpolar?


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y p

A. When it remains above the horizon for 24

hours

B. When the body has a declination of 2325

min, N or SC. When the body has zero declination

D. When it is at 18below the horizon

NAV JULY A

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