NAV NOV 2004 A IDL
-
Upload
staicu-anghel-elena -
Category
Documents
-
view
219 -
download
0
Transcript of NAV NOV 2004 A IDL
-
8/13/2019 NAV NOV 2004 A IDL
1/184
-
8/13/2019 NAV NOV 2004 A IDL
2/184
1. What is the zenith d istance (ZX) o f the
body on the hor izon when i t is r is ing and
set t ing?
A. 45
B. 180
C. 90
D. 270
-
8/13/2019 NAV NOV 2004 A IDL
3/184
-
8/13/2019 NAV NOV 2004 A IDL
4/184
2. If a celest ial body is at you r merid ian ,
the azimu th.
A. either south or west
B. either north or east
C. either east or west
D. either north or south
-
8/13/2019 NAV NOV 2004 A IDL
5/184
Z
Na
HSHN
2. Lat. 20N
Dec. 20N
2. Lat. 20N
Dec. 20S
PN
PS
Q
Q
d
d
d
d
-
8/13/2019 NAV NOV 2004 A IDL
6/184
3. A m inimum dis tance a vessel , i f
const rained by not enough sea room
shou ld pass w i th in a tropical storm is: A. 50 miles
B. 80 miles
C. 250 miles D. 100 miles
-
8/13/2019 NAV NOV 2004 A IDL
7/184
APPROX. DIST. RATE OF FALL OF
OF STORM BAROMETER
( INCHES / HOUR )
50 TO 80 MILES 0.12 - 0.15
80 TO 100 MILES 0.08 - 0.12
100 TO 150 MILES 0.06 - 0.08
150 TO 250 MILES 0.02 - 0.06
-
8/13/2019 NAV NOV 2004 A IDL
8/184
4. What is the mos t impo rtant publ icat ion
for co rrect ing charts and thus keeping
them up to date?
A. Radio signals
B. Light lists
C. Notice to Mariners
D. Sailing directions
-
8/13/2019 NAV NOV 2004 A IDL
9/184
Notices to Marinersis published weekly by
United Kingdom Hydrographic Office (UKHO)for Admiralty Charts and Publications and the
Defense Mapping Agency Hydrographic /
Topographic Center (DMAHTC) for U.S.Charts and Publications.
-
8/13/2019 NAV NOV 2004 A IDL
10/184
5. Relat ive hum idi ty is measu red by :
A. hydrometer
B. hygrometer
C. anemometer
D. barometer
-
8/13/2019 NAV NOV 2004 A IDL
11/184
6. The geog raph ical posi t ion o f a ship
may be determ ined by observat ion s of
ei ther f ixed objects on shore or celest ial
bodies and by p lot t ing l ines of po si t ion
ob tained from these observat ions , the
intersect ion of these two l ines represents
the exact posi t ion o f the vessel and isusual ly referred to as a:
A. dead reckoning
B. running fix
C. fix
D. DR
-
8/13/2019 NAV NOV 2004 A IDL
12/184
s
-
8/13/2019 NAV NOV 2004 A IDL
13/184
Pilotage (coastal navigation);
Cross bearing;
The cocked hat;
A running fix;
Dead reckoning;
Astronomical navigation;Satellite.
s
-
8/13/2019 NAV NOV 2004 A IDL
14/184
-
8/13/2019 NAV NOV 2004 A IDL
15/184
PILOTAGE
A CONSPICUOUS OBJECT (CONSPIC)
is an object on land or at sea, which is
mentionedand describedin the pilot book.
-
8/13/2019 NAV NOV 2004 A IDL
16/184
Cross bearings form an
intersectionof twobearing lines
thathave been taken of two
conspicuous objects.
CROSS BEARING
-
8/13/2019 NAV NOV 2004 A IDL
17/184
If possible, a third bearing (check line)
is taken of a third conspic.
-
8/13/2019 NAV NOV 2004 A IDL
18/184
X
X
X
As the ship isproceeding,
a triangleis formed by thetwo bearing lines and the
check line.
Cocked Hat
-
8/13/2019 NAV NOV 2004 A IDL
19/184
When there is only oneconspicuous object,
a position f ixis made
by taking two bearings
of that same conspic
at interval.
-
8/13/2019 NAV NOV 2004 A IDL
20/184
XCourse line
1650
380
The first bearing
is taken at 16.50 hrs;
log reading:
distance travel led =380 nautical miles.
-
8/13/2019 NAV NOV 2004 A IDL
21/184
Course line
16 50380
X
16 55381The second bearing is taken at
16.55 hrs; log reading: distance
travelled = 381 nautical miles.(the angle between the 2 bearing
l ines must be >30 degr.)
-
8/13/2019 NAV NOV 2004 A IDL
22/184
1650
380
16
X
55381
Course line
With the aid of a chart
divider1is measured from the
chart scaleand transferred tothe course line.
-
8/13/2019 NAV NOV 2004 A IDL
23/184
X
1650
380
16 55381The position of the ship is at the
intersectionof the second
bearing line with the line thatruns parallel to the first
bearing line.
-
8/13/2019 NAV NOV 2004 A IDL
24/184
sound
By Dead Reckoning is meant
finding ones position by
taking into consideration:1. Last Known Position
2. Course and Speed
3. Sea and Weather Conditions.
-
8/13/2019 NAV NOV 2004 A IDL
25/184
s
ASTRONOMICAL NAVIGATION
With astronomical navigation
(celestial navigation)
observations are taken of the sun, the moonor the stars (celestial bodies)
with the aid of a sextant.
-
8/13/2019 NAV NOV 2004 A IDL
26/184
SEXTANT-BEARING
The angle between a celestialbodyand the horizon is measured.
With th id f th h t d
-
8/13/2019 NAV NOV 2004 A IDL
27/184
With the aidof the chronometer andthe tables in the nautical almanac
the ships position can be
determined.
Altitude and Azimuthof the Sun at the Horizon
-
8/13/2019 NAV NOV 2004 A IDL
28/184
SATELLITE-BEARING
When taking a satellite bearingby means of the
Global Positioning System
a signal is transmitted from
a satellite, indicating the vesselsposition on the GPS - display.
-
8/13/2019 NAV NOV 2004 A IDL
29/184
s
sound
With the aid of theecho sounder
the depth of the water
can be determined.
TAKING SOUNDINGS
-
8/13/2019 NAV NOV 2004 A IDL
30/184
TAKING SOUNDINGSA signal is transmitted to
the sea bed.
This signal bounces backand is received again
by the echo sounder.
From the time elapsed
between transmission
andreceptionof the signal,the depth of the water
can be determined.
Ocean Bottom
-
8/13/2019 NAV NOV 2004 A IDL
31/184
7. If the alt i tu de of the body is 45, what
w i l l be its zeni th distance?
A. 40 B. 50
C. 45
D. 90
-
8/13/2019 NAV NOV 2004 A IDL
32/184
-
8/13/2019 NAV NOV 2004 A IDL
33/184
8. The stronger the pressu re gradient,
the w ind w i l l be.
A. unchanged
B. none of these
C. weaker
D. stronger
-
8/13/2019 NAV NOV 2004 A IDL
34/184
The pressu re gradient forceis the force that is
usually responsible for accelerat ing a parcel of
ai r f rom a high atmospher ic pressure region
to a low pressure region , resu l ting in w ind. In
meteorology, pressu re gradient forcerefers to
the ho r izon tal movement of ai r.
The pressu re gradient forceacts at r ightang les to isobarsin the direct ion from high
to low pressure. The greater the pressure
differenceover a given horizontal distance, thegreater the force and hence the stronger the
wind.
Pressure Gradient Force
-
8/13/2019 NAV NOV 2004 A IDL
35/184
Pressure Gradient ForceThe change in pressure measured across a
given distance is called a "pressure
gradient" .
-
8/13/2019 NAV NOV 2004 A IDL
36/184
-
8/13/2019 NAV NOV 2004 A IDL
37/184
-
8/13/2019 NAV NOV 2004 A IDL
38/184
9. In tended fo r navigat ion and
ancho rage in harbors and smal l
waterways.
A. harbor charts
B. general charts
C. sailing charts
D. coastal charts
-
8/13/2019 NAV NOV 2004 A IDL
39/184
CHART CLASSIFICATION 1.HARBOUR CHART-(1:50,000 & LARGERSCALE)USE IN HARBOUR AND SMALLERWATERWAYS.
2.COASTAL CHART-(1:50,000150,000)USEFOR INSHORE NAVIGATION,ENTERING/LEAVING HARBOURS.
3.GENERAL CHART-(1:150,000600,000)OUTSIDE OF OUTLYING REEF AND SHOALS.
4.SAILING CHART-(1:600,000 & SMALLER
SCALE)USE FOR VOYAGE PLANNING,FORSAILING BETWEEN DISTANT COASTWISEPORT.
-
8/13/2019 NAV NOV 2004 A IDL
40/184
10. From lat 14 N thru lat 14 S, what is
the d lat?
A. 28 S B. 22 S
C. 22 N
D. 28 N
-
8/13/2019 NAV NOV 2004 A IDL
41/184
10. Solu t ion :
Lat = 14 N
Lat = 14 S ( + )
Dlat = 28 S
Rules fo r Dlat.
Lat Same Name ( - )
Lat Diff . Name ( + )
-
8/13/2019 NAV NOV 2004 A IDL
42/184
11. It is the direct ion in wh ich a vessel is
po inted as the angular distance from
North usually 000 at North c loc kw iseth ro ugh 360.
A. track
B. heading C. course
D. bearing
AZIMUTH The hori ontal direction or b i f
-
8/13/2019 NAV NOV 2004 A IDL
43/184
AZIMUTH = The horizontal direction or bearing o fa celest ial po int from a terrestr ial poin t,expressed as the angular distance from a referencedirection measured from 000 clockwise to 360.
COURSE = The direct ion in w/c a vessel issteered o r intended to be steeredexpressed asangular distance from north usually from 000clockwise / counterclockwise through 360
HEADING = The horizontal direct ionin w/c shipusual ly po ints or heads at any instant, expressedin angular units from 000 clockwise to 360.
TRACK= The path o f intended travel of a ship
with respect to the Earth as drawn in the chart
TRUE
-
8/13/2019 NAV NOV 2004 A IDL
44/184
By headingis meant:
the angle between
the fore-and-aft line
and True North.
SOUND
HEADINGTRUE
NORTH
COURSE
-
8/13/2019 NAV NOV 2004 A IDL
45/184
sound
COURSE
Bycourse
is meant:the direction
in which the vessel
is steered.It is expressed in
degrees.
-
8/13/2019 NAV NOV 2004 A IDL
46/184
Do not confuse
headingand
course;
HEADING AND COURSE
heading constantlychanges due to
sea- and wind
influencesandand steer ing errors.
TRACK
-
8/13/2019 NAV NOV 2004 A IDL
47/184
sound
TRACK
The track
consists of oneor a number of
course lines
along which thenavigator
intends to proceed.WK
-
8/13/2019 NAV NOV 2004 A IDL
48/184
-
8/13/2019 NAV NOV 2004 A IDL
49/184
13. Formation of water vapor in free
atmosphere takes p lace by the presence
o f m inu te part ic les, cal led : A. gases
B. nuclei
C. all of these D. carbons
14 M i d i h M
-
8/13/2019 NAV NOV 2004 A IDL
50/184
14. Measu ring d istances on the Mercator
chart is done through the use of :
A. longitude scale B. latitude scale
C. speed scale
D. weighing scale
SC
-
8/13/2019 NAV NOV 2004 A IDL
51/184
SCALE RATIO OF A LENGTH ON A CHART TO THE
ACTUAL LENGTH ON THE SURFACE OF THEEARTH.
A. REPRESENTIVE FRACTION
OR NUMERICAL SCALE( EX. 1:50,000 )
B. GRAPHIC SCALE
CHARTS ACCORDING TO SCALE:
1.SMALL SCALE - COVERS LARGE AREA
2.LARGE SCALECOVERS SMALL AREA
EXAMPLE:
15 Th t i t i i d b th
-
8/13/2019 NAV NOV 2004 A IDL
52/184
15. The steam ing t ime acqu ired by the
vessel is 149.6 hou rs, how many days
of navigat ion d id she travel? A. 6 days 5 hours 36 minutes
B. 6 days 8 hours 35 minutes
C. 6 days 6 hours 30 minutes D. 6 days 7 hours 30 minutes
-
8/13/2019 NAV NOV 2004 A IDL
53/184
15. Solu t ion :
149.6 / 24
Ans. 06 days 05 hours 36 minu tes
-
8/13/2019 NAV NOV 2004 A IDL
54/184
16. This is the direct ion in which the ship
is heading
A. course B. meridional parts
C. dlat
D. dlo
Merid ional Parts = The leng th o f the arc
-
8/13/2019 NAV NOV 2004 A IDL
55/184
Merid ional Parts = The leng th o f the arcof a meridian between the equator andag iven paral lelon a Mercator chart,
expressed in units of 1 minute of longitude atthe equator.
Difference of Lat i tude= The shorter arc o f
any meridian between the paral lel of twoplaces, expressed in angular measure.
Difference of Long i tude= The smallerang le at the poleor the shorter arc o f aparal lel between the meridian of two
placesat the equator, expressed in angularmeasure.
-
8/13/2019 NAV NOV 2004 A IDL
56/184
17. The LMT of longitude 78 18 W is
04H 03M. Find the GMT.
A. 23H 00M
B. 23H 03M
C. 09H 00M
D. 09H 16M
-
8/13/2019 NAV NOV 2004 A IDL
57/184
17. Solu t ion :
Long in Time = 05h 13.2m (78 18 W ) LMT = 04h 03m ( + )
GMT = 09h 16.2 m
Rules For GMT
From LMT to GMT, Long W ( + ) E ( - )
From GMT to LMT, Long W ( - ) E ( + )
-
8/13/2019 NAV NOV 2004 A IDL
58/184
18. Compass best, error is :
A. west
B. east
C. north
D. south
-
8/13/2019 NAV NOV 2004 A IDL
59/184
19. The ship left from latitude 42 29.7 N,
and the Dlat is 8.8 S, find the latitude
in?
A. 42 23 N
B. 42 22 N
C. 42 20.9 N
D. 42 25 N
19 S l t i
-
8/13/2019 NAV NOV 2004 A IDL
60/184
19. Solu t ion :
Lat fr. = 42 29.7 N
Dlat. = 8.8 S ( - )
Lat in = 42 20.9 N
-
8/13/2019 NAV NOV 2004 A IDL
61/184
20. The cons truc t ion o f charts requires
that the areas o f certain spaces on the
chart shal l have the same rat io to oneano ther as the corresponding spaces on
the surface of the earth .
A. equivalence B. convergence
C. inconvenience
D. convenience
-
8/13/2019 NAV NOV 2004 A IDL
62/184
21. For 18 hours, a vessel steamed at
an average speed o f 10 kts . What was
the total distance? A. 200 miles
B. 100 miles
C. 300 miles
D. 180 miles
22 The chart indicates the variat ion was
-
8/13/2019 NAV NOV 2004 A IDL
63/184
22. The chart indicates the variat ion was
3 48 W in 1996 and the annual change
is 8 W. If you use the chart in 2000, howmuch var iat ion should you apply?
A. 3 16 W
B. 4 20 W C. 4 20 E
D. 3 16 E
22 Solu tion :
-
8/13/2019 NAV NOV 2004 A IDL
64/184
22. Solu t ion :
Variation = 3 48 W ( 1996 )
Annual Change = 8 x 4 ( 2000 ) Correction = 0 32 W
Variation = 3 48 W ( + )
Actual = 4 20 W
Variat ion
23 The co rrect ion to be app l ied to ships
-
8/13/2019 NAV NOV 2004 A IDL
65/184
23. The co rrect ion to be app l ied to ship s
t ime to obtain the co rrespond ing
Greenw ich Meridian Time pref ixed by
plus (+) sign at Western Longi tude and
by m inus (-) sign at Eastern Longi tude.
A. longitude in time
B. zone description
C. equation of time
D. zone meridian
24 The Great Circle d istance from
-
8/13/2019 NAV NOV 2004 A IDL
66/184
24. The Great Circle d istance from
Latitude 35 08 S, Longitude 029 26 E
to Latitude 33 16 S, Longitude 116 36
E is 4,172.7 miles and the In it ial course
is 117 T. What is the Latitude of Vertex?
A. 43 13.4 S
B. 43 18.5 S
C. 43 15.9 S
D. 44 49.1 S
-
8/13/2019 NAV NOV 2004 A IDL
67/184
25 T i d i hi 20
-
8/13/2019 NAV NOV 2004 A IDL
68/184
25. Two w ind pressu re system w ithin 20
- 30 Lati tu des:
A. trade wind belt B. westerlies
C. polar low belt
D. doldrum
-
8/13/2019 NAV NOV 2004 A IDL
69/184
EQ DOLDRUMS
30N
30S
HORSE LAT.
HORSE LAT.
60N
60S
CORIOLIS FORCE
N E TRADE
S E TRADE
P. WLY
P. WLY
POLAR ELY
POLAR ELY
40 40ROARINGFORTIES
26 A vessel sails from Lat 30 13 14 N
-
8/13/2019 NAV NOV 2004 A IDL
70/184
26. A vessel sails from Lat 30 13 14 N.
Long 125 30 20 E to Lat 45 N, Long
108 45 30 E. Find DLAT and DLO? A. 75 13 14 N / 016 44 50 W
B. 14 46 46 N / 016 44 50 W
C. 75 13 14 N / 125 44 10 E D. 14 46 46 S / 125 44 10 E
26 Solu tion :
-
8/13/2019 NAV NOV 2004 A IDL
71/184
26. Solu t ion :
Lat 1 = 30 13 14 N
Lat 2 = 45 N Dlat = 14 46 46 N
Long 1 = 125 30 20 E
Long 2 = 108 45 30 E
Dlo = 16 44 50 W
27. Defini te pattern o f weather fo r a long
-
8/13/2019 NAV NOV 2004 A IDL
72/184
p g
per iod of t ime.
A. all of these B. season
C. climate
D. weather
28 What is the per iodical publ icat ion s o f
-
8/13/2019 NAV NOV 2004 A IDL
73/184
28. What is the per iodical publ icat ion s o f
astronom ical data designed pr imar i ly for
marine navigat ion?
A. Nautical Almanac
B. World Almanac
C. Notice to Mariners D. Sailing directions
29 On the Trop ic where the Earths
-
8/13/2019 NAV NOV 2004 A IDL
74/184
29. On the Trop ic where the Earth s
def lect ing force is very s l ight , the
dom inant factor is a force wh ich
contr ibute to the tendency o f the w ind
to go o ff at a tangent to the isobars is:
A. frictional resistance force
B. centrifugal force
C. centripetal force
D. coriolis force
30 I t t i l l d l f th
-
8/13/2019 NAV NOV 2004 A IDL
75/184
30. In ternat ional ly used value o f the
atmospher ic p ressu re in metr ic sys tem .
A. 29.92 inches B. 760 mm column of mercury
C. 14.7 lbs per square inch
D. 1,013 millibars
31. Find what course to steer from a
-
8/13/2019 NAV NOV 2004 A IDL
76/184
31. Find what course to steer from a
p lace in lat i tude 12 17 Sand long i tude
34 29 E to latitude 12 17 Sand
longitude 79 16 E.
A. south west
B. west C. east
D. south east
-
8/13/2019 NAV NOV 2004 A IDL
77/184
33 Visibi l i ty is affected by l iqu id
-
8/13/2019 NAV NOV 2004 A IDL
78/184
33. Visibi l i ty is affected by l iqu id
part ic les wh ich condenses less than 0
C or 32 F in the atmosphere is called: A. mist
B. frost
C. dew D. fog
Mist = An aggregate of very small water
-
8/13/2019 NAV NOV 2004 A IDL
79/184
Mist = An aggregate of very small water
droplets suspended in the atmosphere. It
produces a thin, grayish vei l over thelandscape. The relat ive hum idi tyis often
95%.
Dew
= Thecondensation formed dur ing
the night as a result of relatively warm area
contact ing a coo l sur face.
Fog= A visible accumulation oftiny
droplets of water formed bycondensat ion
of water vapo r in the air, with the base at
the surface of the Earth.
34. What sai l ing method should not be
-
8/13/2019 NAV NOV 2004 A IDL
80/184
34. What sai l ing method should not be
used for d is tances more than a few
hundred m i les?
A. Plane sailing
B. Mercator Sailing
C. Parallel Sailing D. Traverse Sailing
35. If the LHA o f the sun is 270, what is
-
8/13/2019 NAV NOV 2004 A IDL
81/184
,
the meridian ang le?
A. 90 E B. 80 E
C. 80 W
D. 90 W
MERIDIAN ANGLE = Angular distance
-
8/13/2019 NAV NOV 2004 A IDL
82/184
MERIDIAN ANGLE Angular distance
measured East or West from the Local
Celestial Meridian ( M ) to the body up to180.
LOCAL HOUR ANGLE= Angular distance
measured Westerly from the Local Celestial
Meridian ( M ) to the body up to 360.
MMeridian Angle = 90 E
-
8/13/2019 NAV NOV 2004 A IDL
83/184
M
m
LHA 270
Meridian Angle 90 E
S
36 The sequence of in tervals o f l igh t
-
8/13/2019 NAV NOV 2004 A IDL
84/184
36. The sequence of in tervals o f l igh t
and darkness in which the who le
sequence being repeated ident ic al ly atregu lar interval.
A. period
B. fixed light C. rhythmic light
D. characteristic
37. Find the Great Circle dis tance from
-
8/13/2019 NAV NOV 2004 A IDL
85/184
lat itude 03 S, long itude 134 W to
lat itude 14 S, long itude 103 W.
A. 1,909 miles
B. 1,988 miles
C. 1,899 miles D. 1,951 miles
37. Solu t ion :
-
8/13/2019 NAV NOV 2004 A IDL
86/184
Cos. Dist = ( Cos. L1 x Cos. L2 x Cos. Dlo )
+/- ( Sin L1 x Sin L2 ) =( Cos. 3 x Cos. 14 x Cos. 31 ) +
( Sin 3 x Sin 14 )
Cos. Dist. = 0.83056 + 0.01266
Dist. = 0.84322 inv Cos.
GC Dist. = 32.52
x 60
GC Dis t. = 1,951 nm
38 How far can a ship sai l in 15 m inu tes
-
8/13/2019 NAV NOV 2004 A IDL
87/184
38. How far can a ship sai l in 15 m inu tes
i f her speed is 18 knots?
A. 4.0 N.M
B. 4.5 N.M
C. 4.8 N.M
D. 5.0 N.M
39. The actual speed o f the vessel over
-
8/13/2019 NAV NOV 2004 A IDL
88/184
39. The actual speed o f the vessel over
the su rface o f the earth at any g iven
time. A. speed over the ground
B. speed of intention
C. speed of advance D. speed on the water
Speed o f Advance = The speed made
-
8/13/2019 NAV NOV 2004 A IDL
89/184
p pgood along the track or the average speedin knots w /c must be maintained dur ing a
passage to arr ived at a dest inat ion.Speed Made Good= The speedest imated by d iv id ing the last f ix and an
EPby the time between the fix and the EP.Speed on the Water= The speed obtainedby the vessel after allowing for the effects o fcu rrent , wind, waves, swel letc. It is alsoknown as Speed Made Good.
COURSE OVER GROUND
-
8/13/2019 NAV NOV 2004 A IDL
90/184
S
soundA
B
By course over ground
is understood thecourse that the ship
will follow if no
allowances are made
for the effects caused
by wind and sea
(the vessel will end up
in C).
C
COURSE MADE GOOD
-
8/13/2019 NAV NOV 2004 A IDL
91/184
soundA
B
By course made
goodis
understood
the course that
the ship will follow
after allow ing forthe effects caused
by w ind and sea.
40. Wind tend s to b low in circular along
-
8/13/2019 NAV NOV 2004 A IDL
92/184
the isobar instead o f perpend icular to
the isobar, part ly due to:
A. difference in pressure and
temperature between two localities
B. difference of pressure between twolocalities
C. coriolis force
D. difference of temperature betweentwo localities
41. The course given is S 83 22 E, find
-
8/13/2019 NAV NOV 2004 A IDL
93/184
41. The course given is S 83 22 E, find
the true course?
A. 96 39 B. 96 36
C. 96 38
D. 96 40
-
8/13/2019 NAV NOV 2004 A IDL
94/184
1stQuadrant
AS IS
2ndQuadrant
( - ) 180
3rdQuadrant
( + ) 180
4thQuadrant
( - ) 360
N
S
EW
180 00
S 83 22E ( - )96 38
-
8/13/2019 NAV NOV 2004 A IDL
95/184
43. The type of c louds prom inent in
-
8/13/2019 NAV NOV 2004 A IDL
96/184
hi lly or mountainous dis t ric ts covering
the hi l l tops.
A. cumulus-nimbus
B. frontal cloud
C. orographic cloud D. cumulus
-
8/13/2019 NAV NOV 2004 A IDL
97/184
OROGRAPHIC CLOUDS
44. If the given course is S 69 W, what
-
8/13/2019 NAV NOV 2004 A IDL
98/184
is the true course?
A. 248 B. 249
C. 246
D. 247
45. Which of the fo l low ing pub l ications
-
8/13/2019 NAV NOV 2004 A IDL
99/184
wou ld you refer to ob tain navigational
in format ion when enter ing a foreign port?
A. Sailing Direction
B. Coast Pilot
C. World Port Index D. Notice to Mariners
Sail ing Direct ions= A descriptive book
-
8/13/2019 NAV NOV 2004 A IDL
100/184
containing information of coastal waters,
harbor facilities of an area.
2 K inds o f Sai l ing Direct ion
1. Enroute= consist of 37 volumes
describing features o f coast l ine, po rts and
harbors.
2. Plann ing Guide= consist of 10
volumesdescribe the general features of 8
ocean basins of the wor ld.
46. The meridian ang le o f the body is
-
8/13/2019 NAV NOV 2004 A IDL
101/184
090 W, lati tu de is 45 S. What is the
LHA of the body?
A. 270
B. 090 W
C. 090 E D. 090
-
8/13/2019 NAV NOV 2004 A IDL
102/184
47. The l ine of in tersect ion of a sphere
-
8/13/2019 NAV NOV 2004 A IDL
103/184
and plane through i ts center.
A. small circle B. half circle
C. hour circle
D. great circle
PNTHE EARTH AS A SPHERE
-
8/13/2019 NAV NOV 2004 A IDL
104/184
EQUATOR
MERIDIANS
SMALL CIRCLE
EW
PS
SEMI GREAT CIRCLE
48. Compass least , erro r is:
-
8/13/2019 NAV NOV 2004 A IDL
105/184
48. Compass least , erro r is:
A. east
B. north
C. south
D. west
-
8/13/2019 NAV NOV 2004 A IDL
106/184
-
8/13/2019 NAV NOV 2004 A IDL
107/184
50. The shape of the earth is:
-
8/13/2019 NAV NOV 2004 A IDL
108/184
p
A. sphere
B. elliptical
C. circle
D. oblate spheroid
51. The rate of temperatu re decrease
i th h i ht l t i d t
-
8/13/2019 NAV NOV 2004 A IDL
109/184
w ith height , common ly not iced at
troposphere is cal led:
A. inversion rate
B. adiabatic changes
C. lapse rate D. none of these
Adiabat ic Changes= Referring to a
-
8/13/2019 NAV NOV 2004 A IDL
110/184
thermodynamic change of state of a system
in w/c there is no transfer of heat or mass
across the boundaries of the system. In
Adiabatic process, Compression causes
Warm ing whi le Expans ion causes
Cool ing.
Temperature Inversion= An atmospheric
condition in which the temperature
inc reases w ith inc reasing alt itude.
52. Desc ript ive term used fo r Beaufo rt
N 10 ith i d 48 55 k t i
-
8/13/2019 NAV NOV 2004 A IDL
111/184
No.10 w ith w ind 48-55 kno ts is :
A. storm B. hurricane
C. violent storm
D. strong gale
-
8/13/2019 NAV NOV 2004 A IDL
112/184
53. A pro ject ion o ften i l lustrated as a
l i d
-
8/13/2019 NAV NOV 2004 A IDL
113/184
cyl inder.
A. mercator projection
B. polyconic projection
C. gnomonic projection
D. lambert conformal
-
8/13/2019 NAV NOV 2004 A IDL
114/184
-
8/13/2019 NAV NOV 2004 A IDL
115/184
-
8/13/2019 NAV NOV 2004 A IDL
116/184
54. Wh ich of the fol low ing is the off ic ial
publ icat ion fo r the co rrect ion of charts
-
8/13/2019 NAV NOV 2004 A IDL
117/184
publ icat ion fo r the co rrect ion of charts,
sai l ing d irect ions, l igh t l ist , etc.
A. list of radio signals
B. coast pilot
C. list of lights D. notice to mariners
55. This is the symbo l for stratus c loud.
A St
-
8/13/2019 NAV NOV 2004 A IDL
118/184
A. St
B. Cu C. Cs
D. Ci
-
8/13/2019 NAV NOV 2004 A IDL
119/184
-
8/13/2019 NAV NOV 2004 A IDL
120/184
57. A low form of sheet cloud
resembl ing a fog bu t not rest ing on the
-
8/13/2019 NAV NOV 2004 A IDL
121/184
resembl ing a fog bu t not rest ing on the
ground.
A. cirrus
B. nimbus
C. stratus D. cumulus
58. The po int w h ich the Great Circle
track reaches its h ighest lat i tude
-
8/13/2019 NAV NOV 2004 A IDL
122/184
t rack reaches its h ighest lat i tude.
A. vertex
B. rhumb course
C. vortex
D. rhumbline
59. An error o f the magnet ic compass
ca sed b the magnet ic f ield of the
-
8/13/2019 NAV NOV 2004 A IDL
123/184
caused by the magnet ic f ield of the
earth.
A. compass
B. refraction
C. variation D. deviation
-
8/13/2019 NAV NOV 2004 A IDL
124/184
61. A re small circ le o f the earth whose
p lane are paral lel to the p lane o f the
-
8/13/2019 NAV NOV 2004 A IDL
125/184
p lane are paral lel to the p lane o f the
equator.
A. great circle
B. small circle
C. parallel of latitude D. equator
PNTHE EARTH AS A SPHERE
-
8/13/2019 NAV NOV 2004 A IDL
126/184
EQUATOR
MERIDIANS
SMALL CIRCLE
EW
PS
SEMI GREAT CIRCLE
62. Your are in 120 W and your sh ip
-
8/13/2019 NAV NOV 2004 A IDL
127/184
t ime is 2030 hrs . June 20th . Find GMT?
A. 0430 hrs / 21 June B. 1230 hrs / 20 June
C. 0430 hrs / 20 June
D. 1230 hrs / 21 June
63. Fron t replacing co ld air masses.
-
8/13/2019 NAV NOV 2004 A IDL
128/184
A. stationary front
B. cold front
C. occluded front
D. warm front
64. The best course of act ion i f a storm
is suspected in the vic in i ty the
-
8/13/2019 NAV NOV 2004 A IDL
129/184
is suspected in the vic in i ty, the
fo l low ing know ledge is necessary.
A. all of these
B. the bearing of the center of the storm
C. the drop of the barometric pressure D. the path of the storm
65. The art o f conduct ing a vessel in
channels harbo rs and along the coast
-
8/13/2019 NAV NOV 2004 A IDL
130/184
channels, harbo rs and along the coast.
A. dead reckoning
B. terrestrial navigation
C. piloting
D. electronic navigation
66. If the latitu de is 47 N and the
decl ination is 18S the amplitude of
-
8/13/2019 NAV NOV 2004 A IDL
131/184
declination is 18 S, the amplitude of
the body when set t ing is:
A. S 27 E
B. W 27 N
C. E 27 S D. W 27 S
66. Solu t ion :
Sin Ampl = Sin Dec
-
8/13/2019 NAV NOV 2004 A IDL
132/184
Sin Ampl. = Sin Dec
Cos. Lat Sin Ampl. = Sin 18
Cos. 47
Ampl. = 0.45310 inv Sin Ampl. = W 26.94 S
67. A sh ip covers a distance of 12 m iles
in 2 hrs Find her speed?
-
8/13/2019 NAV NOV 2004 A IDL
133/184
in 2 hrs . Find her speed?
A. 8 knots B. 6.5 knots
C. 7 knots
D. 6 knots
68. Is fo rmed by the aggregat ion o f ice
crystal
-
8/13/2019 NAV NOV 2004 A IDL
134/184
crystal .
A. snow B. frost
C. rain
D. drizzle
69. What is the meridional parts o f
latitude 6 47 S?
-
8/13/2019 NAV NOV 2004 A IDL
135/184
latitude 6 47 S?
A. 405.7
B. 405.2
C. 405.6
D. 405.5
How To Acquire Meridional Parts
-
8/13/2019 NAV NOV 2004 A IDL
136/184
Meridional Parts= Lat. / 2 + 45 = Tanlog x 7915.7Lat Sin x 23.3
70. In paral lel sai l ing the difference of
long i tude can be ob tained by
-
8/13/2019 NAV NOV 2004 A IDL
137/184
long i tude can be ob tained by
mul t ip ly ing.
A. dep. and sec. mlat
B. dep. and sine lat
C. dep. and sec. lat D. dep. and sine mlat
71. Find the GHA of A ries from the
following: GHA of star 061 34 5 and
-
8/13/2019 NAV NOV 2004 A IDL
138/184
following: GHA of star 061 34.5 and
SHA of star 301 47.6?
A. 119 46.9
B. 240 13.1
C. 120 49.6 D. 191 49.6
71. Solu t ion :
GHA = ?
-
8/13/2019 NAV NOV 2004 A IDL
139/184
GHA ?
SHA* = 301 47.6 GHA* = 061 34.5
SHA* = 301 47.6 ( - )
GHA = 119 46.9
( + ) 360
G
GHA * = 61 34.5
SHA * = 301 47.6
-
8/13/2019 NAV NOV 2004 A IDL
140/184
g
S
GHA = 119 46.9
-
8/13/2019 NAV NOV 2004 A IDL
141/184
73. The apparen t path o f the sun
around the earth
-
8/13/2019 NAV NOV 2004 A IDL
142/184
around the earth .
A. hour angle B. ecliptic
C. ellipse
D. equinoctial
-
8/13/2019 NAV NOV 2004 A IDL
143/184
74. A lso in the construct ion of charts
requ ires that the distances from any two
-
8/13/2019 NAV NOV 2004 A IDL
144/184
q y
po ints to the center of the chart shal l
have the same rat io to each oth er as the
co rrespond ing distances.
A. semi-distance
B. variable distance
C. short distance
D. equidistance
75. Which of the fo l low ing publ icat ions
wou ld you refer to ob tain navigat ional
-
8/13/2019 NAV NOV 2004 A IDL
145/184
ou d you e e to ob ta a gat o a
informat ion when enter ing a foreign
por t?
A. Light lists
B. Sailing directions
C. Radio signals
D. Notice to mariners
76. The rat io o f a given d istance on the
chart to the actual distance wh ich i t
-
8/13/2019 NAV NOV 2004 A IDL
146/184
represents on the earth .
A. terrestrial distance
B. scales
C. measurements
D. rhumbline
77. The Great Circ le d istance from
Latitude 36 57.2 N, Longitude 006 45.7
-
8/13/2019 NAV NOV 2004 A IDL
147/184
, g
W to Latitude 24 25.3 N, Longitude 085
02.6 W is 3,999 miles and the initial
course is 283.8 T. What is the long itude
of the vertex?
A. 039 19.5 W
B. 059 09.5 W
C. 029 09.5 W
D. 019 19.5 W
77. Solut ion:
CosLat V = Cos L1 x Sin I.C.
-
8/13/2019 NAV NOV 2004 A IDL
148/184
= Cos 36 57.2 x Sin 76.2
= 0.776058 inv Cos
Lat V = 39.09N
Lat V = 39 05.9 N
Sin Dlo V = Cos I.C. / Sin Lat V
= Cos 76.2 / Sin 39.09
= 0.37830 inv Sin
Dlo V = 22 13.7 W Long 1 = 006 45.7 W (+)
Long V = 28 59.4 W
RULES FOR DLO OF VERTEX
DLO of vertex is the DLO from Departure
-
8/13/2019 NAV NOV 2004 A IDL
149/184
DLO of vertex is the DLO from Departure
to the vertex. If the I.C. ang le is less than 90,then
vertex is aheadof you and in the direction
of your original DLO. If the I.C. ang le is more than 90,then the
vertex is behindand in the direction of
your DLO.
78. The alternative sail ing in l ieu o f Great
Circle to l im it the lat i tude of vertex.
-
8/13/2019 NAV NOV 2004 A IDL
150/184
Circle to l im it the lat i tude of vertex.
A. mercator sailing B. composite sailing
C. parallel sailing
D. great circle sailing
79. This is the symbo l for cum ulus
cloud
-
8/13/2019 NAV NOV 2004 A IDL
151/184
cloud.
A. St B. Cs
C. Cu
D. Ci
-
8/13/2019 NAV NOV 2004 A IDL
152/184
81. From long 155 E th ru 155 W, what is
the dlong?
-
8/13/2019 NAV NOV 2004 A IDL
153/184
g
A. 310 E
B. 050 E
C. 050 W
D. 310 W
81. Solu t ion :
Long 1 = 155 E
-
8/13/2019 NAV NOV 2004 A IDL
154/184
Long 1 155 E
Long 2 = 155 W ( + ) Dlo = 310
(-) 360
Dlo = 50 E
82. Sai l ing method where a vessel is
due east o r west.
-
8/13/2019 NAV NOV 2004 A IDL
155/184
A. parallel sailing
B. mercator sailing
C. traverse sailing
D. plane sailing
83. Convert 7 hrs 15 m ins. 42 secs . to
ARC.
-
8/13/2019 NAV NOV 2004 A IDL
156/184
A. 108 45 10
B. 105 13 55
C. 108 10 30
D. 108 55 30
Convert Time to A rc
7 Hrs. 15 mins. 42 secs.
-
8/13/2019 NAV NOV 2004 A IDL
157/184
7 Hrs. x 15 = 105 15 m / 4 = 3
0.75 m x 60 = 45
42 s / 4 = 10 0.5 x 60 = ( + ) 30
Answer = 108 55 30
84. A great c irc le at lati tu de 0.
A prime meridian
-
8/13/2019 NAV NOV 2004 A IDL
158/184
A. prime meridian
B. poles C. equator
D. international date line
85. The three-d imens ional shape
ob tained by rotat ing an el lipse about i ts
-
8/13/2019 NAV NOV 2004 A IDL
159/184
mino r axis.
A. ellipsoid of revolution
B. precession of the axis
C. rotation of the earth D. revolution of the earth
86. Notices to Mariners are pub l ished:
A weekly
-
8/13/2019 NAV NOV 2004 A IDL
160/184
A. weekly
B. bi-annually
C. monthly
D. yearly
87. From position Lat. 23 21 N, Long
125 28 E, vessel proceeded through
-
8/13/2019 NAV NOV 2004 A IDL
161/184
along the great circ le track to arr ival
position at Lat. 40 08 N, Long 175 45W. Find the Great Circle Distance?
A. 4,104 nm
B. 3,104 nm
C. 2,104 nm
D. 5,104 nm
-
8/13/2019 NAV NOV 2004 A IDL
162/184
88. Distance along the great circle
connect ing two points .
-
8/13/2019 NAV NOV 2004 A IDL
163/184
A. small circle distance
B. loxodromic curve
C. great circle distance
D. distance
89. The l ine o f intersect ion o f a sphere and
plane wh ich does not pass through i ts
t
-
8/13/2019 NAV NOV 2004 A IDL
164/184
center.
A. half circle
B. great circle
C. hour circle
D. small circle
90. Find the LHA of star, i f the GHA of
the star is 81 57.3 and the longitude is
174 32 9 W
-
8/13/2019 NAV NOV 2004 A IDL
165/184
174 32.9 W.
A. 240 24.4
B. 92 35.6
C. 267 24.4
D. 256 30.2
-
8/13/2019 NAV NOV 2004 A IDL
166/184
M
g LONG. = 174 32.9 WLHA * = 267 24.4
-
8/13/2019 NAV NOV 2004 A IDL
167/184
m
S
G GHA * = 81 57.3
91. A U.K . based pub l icat ion agency
which special izes in the naut ical
-
8/13/2019 NAV NOV 2004 A IDL
168/184
publ icat ions.
A. DOD
B. DMA
C. MMDA D. UKHO
92. When the air is heated at the bo ttom ,
i t becom es:
-
8/13/2019 NAV NOV 2004 A IDL
169/184
A. none of these
B. saturated
C. unstable
D. stable
93. Wh ich is LEAST true why there is a
non-constant rate on the apparent sunas
l t i l f f t i ?
-
8/13/2019 NAV NOV 2004 A IDL
170/184
a celest ial reference for t ime?
A. Motion of the sun along the ecliptic is tilted
B. Revolution of the Earth on its orbit is not
constant
C. The effect of the nutation on the Earths
rotational axis
D. Rotation of the Earth on its axis is notconstant
94. It is th e sextant erro r on the index
m irror when not perpend icular to the
l f h i
-
8/13/2019 NAV NOV 2004 A IDL
171/184
plane of the ins trument.
A. parallax error
B. index error
C. side error D. perpendicularity
ERROR OF PERPENDICULARITY
-
8/13/2019 NAV NOV 2004 A IDL
172/184
-
8/13/2019 NAV NOV 2004 A IDL
173/184
96. Ocean average depth is:
A. none of these
-
8/13/2019 NAV NOV 2004 A IDL
174/184
B. 2,075 feet C. 2,075 meters
D. 2,075 fathoms
97. You are in long 175 W and head ing
270, where do you change clocks?
A 172 30 E
-
8/13/2019 NAV NOV 2004 A IDL
175/184
A. 172 30 E
B. 165 30 E
C. 172 30 W
D. 180
175 W172 30 E
-
8/13/2019 NAV NOV 2004 A IDL
176/184
180
IDL
165 W165 E150 E 150 W
CO. =270
+1112-11-10
12 +11 +10-11
98. Type of t idal occu rrence wh ich is
character ized by a larger inequali ty in
th hi h t h i ht i b th H
-
8/13/2019 NAV NOV 2004 A IDL
177/184
the high water heights or in both . Hence
are usual ly two h igh and low water each
day, bu t occasional ly the t ide may
become diu rnal .
A. none of these
B. diurnal
C. semi-diurnal
D. mixed type
MIXED TIDE
LARGE INEQUALITIES
-
8/13/2019 NAV NOV 2004 A IDL
178/184
-
8/13/2019 NAV NOV 2004 A IDL
179/184
100. When the temperature decreases o r
the dens i ty o f the atmosphere inc reases,
the propagated waves are bended upward
-
8/13/2019 NAV NOV 2004 A IDL
180/184
the propagated waves are bended upward
causing the decrease of radar hor izon.
A. none of these
B. normal refraction
C. sub- refraction
D. super-refraction
-
8/13/2019 NAV NOV 2004 A IDL
181/184
Super Refract ion
-
8/13/2019 NAV NOV 2004 A IDL
182/184
SUB-REFRACTION
DECREASED RANGE OF RADIO SIGNAL
-
8/13/2019 NAV NOV 2004 A IDL
183/184
DECREASED RANGE OF RADIO SIGNAL
(ABSORBED BY COLD MOIST AIR)
MOIST & COLD
DRY & WARM
TX RX
Sub-Refract ion
-
8/13/2019 NAV NOV 2004 A IDL
184/184