navigation questions

7/30/2019 NAVIGATION QUESTIONS

1/141


2/141

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

the moon to go to all phases?

A. Lunation

B. Lunar eclipse

C. Lunar cycle

D. Lunar oscillation


3/141


4/141

2. The relat ive narrow extension of any

ant icyc lone or h igh p ressu re area

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

A. Isobar

B. TroughC. Ridge

D. Edge


5/141


6/141


7/141

3. Find the GHA of A ries i f the SHA of the

star was 10931.8 and the GHA of thestar was 22517.2.

A. 115 49.4

B. 115 45.4

C. 334 49.0D. 334 35.0


8/141

3. Solu t ion :

GHA = ?

SHA = 10931.8

GHA = 22517.2

SHA = 109 31.8 ( - )

GHA = 11545.4


9/141

4. This is an ins trument used in

measu r ing the hum idi ty o f the air

cons is t ing o f a dry and wet bulbthermometer .

A. Barograph

B. ThermographC. Hydrometer

D. Hygrometer


10/141

SLING HYGROMETER


11/141

DIGITAL HYGROMETER


12/141

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


13/141

5. Solu t ion

C/ = 296

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

Var. = 6 W ( - )

T/ = 302


14/141

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

from 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


15/141

AZIMUTH= The horizontal direction orbearing o f

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


16/141

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

celest ial sphere?A. Solstice

B. Apogee

C. Equinox

D. Perihelion


17/141
http://upload.wikimedia.org/wikipedia/commons/d/de/Ecliptic_path.jpg


18/141
http://upload.wikimedia.org/wikipedia/commons/d/de/Ecliptic_path.jpg


19/141

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


20/141


21/141

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

the same name, what is the al t itude of the

body at merid ian transi t?A. 0

B. 90

C. 180D. 45


22/141

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


23/141

11. What is the usual sequence of

di 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


24/141


25/141


26/141


27/141

12. What is the angle of observat ion

between true no rth as a reference poin t

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

A. Compass bearing

B. Magnetic bearingC. True bearing

D. Geographic bearing


28/141

13. A vessel at Lat 3214.7 N, Long 6628.9 W heads for a destination at Lat 3658.7 N, Long 7542.2 W. Determine thecourse and distance by Mercator sai l ing .A. 058.2 T, 241.2 miles

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

D. 348.3 T, 300.2 miles


29/141

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


30/141

How to acqu ire meridional parts by calcu lator

MP = Lat / 2 + 45 = Tan log x 7915.7 Lat 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 ( + )


31/141

Dist. = Dlat / Cos Co.

= 284 / Cos 58 09

= 284 / 0.527697

Dis t. = 538.2 nm


32/141

14. What is the reference in determ ining

the sidereal t ime?

A. SolsticeB. Meridian angle

C. Equinox

D. First Point Aries


33/141


34/141

15. You depart Lat 1854 N, Long 7300E, 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 13 16 N, Long 58 18 E

B. Lat 13 18 N, Long 54 03 EC. Lat 13 19 N, Long 53 46 E

D. Lat 13 20 N, Long 53 28 E


35/141

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


36/141

RULES FOR LAT 2

Same name ( + )

Diff name ( - )

Dlo = Tan co. x DMP

= Tan 73 x 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 ( - )


37/141

16. What pub l 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


38/141

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


39/141

18. You depart Lat 3814 N, Long 1242 W, for Lat 3814 N, Long 4609 W.What are the course and distance?A. 090 T, 1,576.5 miles

B. 090 T, 2,879.0 miles

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


40/141

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


41/141

19. When consider ing currents to use in

coastal navigat ion , what amount o f

cu rrent is p rudent to use?A. The least

B. Minimum

C. MaximumD. None


42/141

20. The warm d ry air blow ing down the

leeward s ide of the mountain s lopes to

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

B. Fall wind

C. Anabatic windD. Katabatic wind


43/141


44/141

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


45/141

22. You depart Lat 1548 N, Long 17406 E and steam 905 miles on course

090 T. What is the long itude o f arr ival?A. 165 41 W

B. 170 13 W

C. 172 47 WD. 179 06 E


46/141

22. Solu t 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


47/141

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

which the gyroscope dev ices should be

insensit ive to app l ied accelerat ion?A. Law of inertia

B. Archimedes

C. Schuller tunedD. None of these


48/141

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


49/141

25. What is the term used to the apparent

increase in the sem idiameter of a

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

A. Augmentation

B. RefractionC. Parallax

D. Dip

AUGMENTATION


50/141

AUGMENTATIONAPPARENT INCREASE IN SEMIDIAMETER OF CELESTIAL BODY AS ALTITUDE

INCREASES.

SEMI - DIAMETER

REFRACTION


51/141

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


52/141

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


53/141

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


54/141

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


55/141

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 is1817.6 N.A. 31 52.2 N

B. 41 07.8 N

C. 21 32.6 ND. 58 07.8 N

28 Solu t ion :


56/141

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. Subtract if ZX & DEC diff name

LAT will take the name of greater value


57/141

29. What is the co lor o f the l igh t of an

isolated danger mark?

A. RedB. White

C. Yellow

D. Green

30 The ang lar d istance of celest ial bod


58/141

30. The angular d istance of celest ial body

measu red eastward from the fi rs t po int of

A ries is cal led:A. RA

B. LHA

C. GHAD. SHA

31 Th i h l f h i


59/141

31. The azimu th ang le 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 circ le d istance


60/141

32. Determ ine the great circ le d istance

and ini t ial course from Lat 3451.0 N,Long 11501.2 E to Lat 1016.0 S, Long5142.6 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 :


61/141

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 )

= 0.36274 0.10184 RULES FOR GCD


62/141

= 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 63 18.6'

Sin 74 52.7'

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


63/141

Sin I. C. = - 0.98398 x 0.893440.96537

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

Co < = S 65.6 W

(+) 180 ( 3rd Quadrant )

T/ Co . = 245.6

33 The boundary between two air


64/141

33. The boundary between two air

masses is cal led:

A. Pressure gradientB. Isobars

C. Isotherm

D. Front


65/141

FRONTFRONT

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


66/141

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


67/141

35 What is the co lor o f conical buoy


68/141

35. What is the co lor o f conical buoy

under IALA A?

A. RedB. Yellow

C. Green

D. Black

36 This is the hal f of the storm which


69/141

36. This is the hal f of the storm which

l ies to the left of the path in the North

hem isphere and to the r igh t of the pathin the South hem isphere.

A. Dangerous semi circle

B. Navigable semi circleC. Dangerous quadrant

D. Storm track


70/141


71/141

37 In the daily page o f the nautical


72/141

37. In the daily page o f the nautical

almanac, the unshaded c irc le in the

lower r ight hand co rner means :A. Full moon

B. New moon

C. Gibbous moonD. Quarter moon

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


73/141

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

at theoretical sunr ise and sunset?

A. 108B. 102

C. 90

D. 96

39 The standard atmospher ic p ressure


74/141

39. The standard atmospher ic p ressure

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


75/141

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


76/141

41. Find the GHA of A ries from the

fol low ing : GHA of the star 31217.6,SHA of s tar 257

26.8.

A. 209 50.8

B. 054 44.4

C. 054 50.8D. 209 44.4

41. Solu t ion :


77/141

41. Solu t ion :

GHA = ?

SHA = 25720.8

GHA = 31217.6

SHA = 25720.8 (-)

GHA = 054 50.8'

42 Convert 041 39 8 into time


78/141

42. Convert 04139.8 into time.A. 02H 52M 12S

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

D. 02H 46M 39S

43. Convert 03H 45M 51S into long itude.


79/141

43. Convert 03H 45M 51S into long itude.

A. 056 58.9

B. 056 27.8C. 055 34.9

D. 057 14.6

44. A t the master gyro compass, the


80/141

44. A t the master gyro compass, 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


81/141

lat i tude to the do ldrums to def lect?

A. Prevailing westerliesB. Semi permanent high

C. Coriolis force

D. Pressure gradient force

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


82/141

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 of the fol low ing canno t be seen


83/141

g

in the lef t 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 th e apparent p ath by which


84/141

48. What is the apparent path by which

the planets revo lve around the sun?

A. EclipticB. Orbit

C. Axis

D. Diurnal circle

49. The difference between the


85/141

geog raph ic merid ian and the magnet ic

merid ian is cal led:

A. Compass error

B. Deviation

C. VariationD. Dip

50. What is the arc of the hour c ircle


86/141

between the celest ial po le and a poin t in

the celest ial sphere?

A. Declination

B. Altitude

C. Zenith distanceD. Polar distance

51 One of th e advan tage of gyro


87/141

51. One of the advan tage 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


88/141

52 An observer aboard a vessel

pro ceeding th ru s t i ll 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


89/141

Mercator chart to a globe, what w i l l it 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


90/141

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


91/141

of these is less reliable?

A. IslandB. Lighthouse

C. Buoy

D. Mountain peak

56. You are on course 303 T. To check


92/141

the speed o f you r vessel you should

observed a celest ial body on which

bear ing?

A. 000

B. 213

C. 090

D. 123

57. In measu r ing distance from any


93/141

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 tide occu rs when the moon is


94/141

at f i rst quarter and third quarter phase?

A. ApogeanB. Perigean

C. Neap

D. Spring

59. What reg ion o f the earth canno t be


95/141

59. What reg ion 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


96/141

cal led small scale chart and a chart

covering a small area is large-scale.

Wh ich o f 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


97/141

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


98/141

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


99/141

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


100/141

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


101/141

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


102/141

soundings o f equal depth is called?

A. Agonic lineB. Contour

C. Seismographic line

D. Isothach

65. Compass error caused by hor izontal


103/141

so f t i rons 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


104/141

sea, and you s igh t a pair of range l ights .

When in line, they bear 315 per s tandard

magnet ic compass. The chart shows that

the range bearing 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 :


105/141

T/ = 312

Var. = + 6

WM/ = 318

Dev. = 3 E

C/ = 315

67. The property of the gyro scope which


106/141

cause i t to maintain i ts p lane of ro tat ion

is the:A. Torque

B. Precession

C. RigidityD. Spin

68. When the sun is at perihelion , what

i ll b i li i W hi t


107/141

season w i ll be prevai ling in Washing ton,

D.C. and o ther cit ies in Nor th 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


108/141

can int rodu ce an error to the

gy rocompass is called:

A. Gimballing error

B. Damping error

C. Ballistic deflection errorD. Quadrantal

70. A sh ip runs at a speed of 8 knots .

H l i l l i t t k h t d i t


109/141

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

o f 1 m ile?

A. 7.5 minutes

B. 4.8 minutes

C. 5 minutesD. 8.0 minutes

70. Given:


110/141

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


111/141

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


112/141

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 20 N

B. 74 56 N

C. 81 00 N

D. 74 52 N

72. Given:

Alt. 32 48, Lat. 47 52 N


113/141

Alt. 32 48 , Lat. 47 52 N

Find : Dec of body at Lower Transit

HO = 3248+ 90 00'

12248

Lat = 4752 N (-)

Dec = 7456 N

Rules for Circumpo lar body

If Lat and Dec are same name but

Dec > Lat, therefore HO + 90.

73. When a vessel enters a port, what is


114/141

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 w i l l cause the axis o f a

spinn ing gyroscope to turn in a di rect ion


115/141

sp inn ing gyroscope to turn in a di rect 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:


116/141

the Naut ical A lmanac:

A. False

B. True

C. Cannot be determined

D. None of these

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

used fo r navigat ion and anchor ing in


117/141

used fo r navigat ion and anchor ing in

harbo rs and smal l 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):


118/141

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

A. Parabola

B. Arc

C. Straight line

D. Hyperbola

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


119/141

in format ion is no t in the Light 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 sigh t is to be taken

h th b d i


120/141

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 :


121/141

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 fo r p lann ing f ix ing posi t ion s at


122/141

used fo r plann 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 ligh ts, ou ter buoys and

landmarks is classi f ied as:

A. General charts

B. Coast charts

C. Sailing charts

D. Pilot charts

A.

82. What cu rrent changes speed in

direct ion cycl ical ly on somewhat


123/141

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


124/141

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 ang le plane tr iangle ABC,

r igh t ang le at C ang le A = 5845 find


125/141

r ig h 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


126/141

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 high tide


127/141

are in __________ and the high tide

occu 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 cou rse

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


128/141

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 blow from


129/141

knots. The wind appears to blow from

the East at Beaufo rt fo rce 5 (18 knots ).

What is the direct ion o f the true wind?

A. 085

B. 119

C. 100

D. 148

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


130/141

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 m easu red from


131/141

in a Naut ical chart is m easu 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


132/141

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


133/141

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?


134/141

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 great c i rc le sai l ing rou te


135/141

Course in a great circ le sai l 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


136/141

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 :


137/141

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 id e is the:

A Vertical distance from the tidal datum to the


138/141

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


139/141

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


140/141

q y g g

and low water heigh ts?

A. Mixed

B. Semi diurnal

C. Diurnal

D. Solar

100. What condit ions make a celest ial

bod y c ircumpolar?


141/141

y p

A. When it remains above the horizon for 24

hours

B. When the body has a declination of 23 25

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

D. When it is at 18 below the horizon

navigation questions

Documents