NOTES FOR INMARSAT ON BOARD

NOTES IN INMARSAT AND SIGNALS
COMPILED BY:
THRID MATE RODIEN E. PACA

REVIEWERFOR INMARSAT
1. Inmarsat provides satellite coverage up to:
a. 70 degrees
b. 50 degrees
*c. 75 degrees
2. An advantage in the use of inmarsat satellites over terrestrial
communications:
a. enhanced group call
b. global communication
*c. both A and B
3. In sending a telegram thru the inmarsat system to countries where there
are no telex facilities, use 15+ to be assured of delivery as well as
format in accordance with:
a. STCW
b. IMO
*c. CCITT
4. Connects space segments with the national and international fixed
telecommunications networks:
*a. land earth stations
b. satellite
c. network control center
5. Year inmarsat became fully operational:
*a. 1982
b. 1979
c. 1985
6. Diameter of typical inmarsat LES steerable parabolic antenna:
a. between 1 to 4 meters

b. between 5 to 7 meters
*c. between 11 to 14 meters
7. Official languages authorized by inmarsat for use in sending distress
message:
*a. english
b. french
c. spanish
8. Shore-to-ship communications from the satellite-to-ship:
*a. 1.6 GHz band
b. 4.0 GHz band
c. 1.5 GHz band
9. Inmarsat provides communication for:
a. air
b. land
c. sea
*d. all of the above
10. Number of ocean region covered by inmarsat:
*a. four
b. three
c. five
11. Another name for ship earth station:
a. coast earth station
b. satellite control system
*c. mobile earth station
12. Located at the inmarsat hadquarters in london which monitors,coordinates

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and controls the operational network activities of all the satellite in
the network:
*a. Network control center (NCC)
b. land earth station (LES)
c. Network coordination station (NCS)
13. Ship-to-shore communications from SES to satellite:
a. 6 GHz band
b. 4 GHz band
*c. 1.6 GHz band
14. Ship-to-shore communication from the satellite to LES:
*a. 4 GHz band
b. 6 GHz band
c. 1.5 GHz band
15. Most economical facility of inmarsat A in transmitting volume data:
a. telex
*b. high speed data
c. facsimile
16. Shore-to-ship communication from LES to satellite.
*a. 6 GHz band
b. 4 GHz band
c. 1.5 GHz band

17. Inmarsat council is compossed of:
a. 18 members
b. 20 members
*c. 22 members
18. Ocean code for telex in the Indian Ocean region;
a. 582
b. 584
*c. 583
19. Number of satellite control center in the inmarsat system;
*a. 1
b. 2
c. 4
20. Year Inmarsat was established:
a. 1982
b. 1976
*c. 1979
21. Inmarsat terminal/model which transmit information on store and forward:
a. Inmarsat A
*b. Inmarsat C
c. Inmarsat B
22. Inmarsat model under development for introduction in early 1992:
*a. Inmarsat B & M
b. Inmarsat A & C
c. Inmarsat A & P
23. Minimum investment share with inmarsat:
a. 0.10% = US $ 25,000
b. 0.25% = US $ 50,000
*c. 0.05% = US $ 18,000

24. Number of official languages adopted by inmarsat:

a. one
b. three

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*c. four
25. Computes and collects payments for the use of inmarsat satellite system:
*a. L.E.S. owners
b. IMMARSAT
c. INMARSAT agent
26. Size in diameter of an Inmarsat A antenna:
*a. approx. 1 meter
b. approx. 4 meters
c. approx. 0.5 meter
27. Ocean code for telephone in the Indian Ocean region:
a. 872
*b. 873
c. 874
28. Ocean code for telephone in the atlantic ocean region-East:

a. 884
*b. 871
c. 872
29. The emergency priority button shall only be used when the vessel;
a. sends an urgent message
*b. is in real distress
c. sends message everytime
30. A system of data transmission which Inmarsat-C had adopted where data
received by LES/CES processed, and stored for retransmission:
*a. store and forward
b. direct transmission
c. processed transmission
31. Number of network coordination station in every ocean region covered by
Inmarsat:
*a. one
b. two
c. three
32. Inmarsat service which uses the EGC system in broadcasting maritime
safety information:
a. fleetNET
b. fishNET
*c. safetyNET
33. Inmarsat service which uses the EGC system in addressing commercial
information in a single group call:
*a. fleetNET
b. safetyNET
c. fishNET
34. Inmarsat C facility which addresses messages to predetermined group of
ships or vessels in both fixed and variable geographical areas:
*a. enhanced group call (EGC).

b. several calls
c. all vessels call
35. Speed of inmarsat satellite:
a. 10,000 MPH
*b. 7,000 MPH
c. 25,000 MPH
36. The four operational satellites of the Inmarsat system operate in
geostationary orbit 35,700 Km. in line with the;
a. poles
*b. equator
c. meridian

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37. Modern inmarsat antennas are equipped with:
*a. auto tracking
b. manual tracking
c. semi-manual tracking
38. Message which has the priority for transmission:

a. safety
b. urgent
*c. distress
39. Inmarsat terminals upon purchase should be:
*a. commissioned
b. use immediately
c. warmed-up
40. An inmarsat system components which assigns channel upon request from an
Inmarsat terminal to gain access thru the system;
a. NCC
b. SCC
*c. NCS
41. Distress message priority code:
a. 1
*b. 3
c. 2
42. Number of network co-ordination station in the inmarsat system:
a. 5
b. 1
*c. 4
43. Currencies and exchange rates use in Inmarsat bills:
*a. Gold France and special drawing right
b. US$ dollar
c. Sterling pounds
44. An element of GMDSS:
*a. Inmarsat C
b. Maritex
c. SITOR
45. Number of network control centre in the Inmarsat system:
a. 4

*b. 1
c. 3
46. What should be done, when a vessel equiped with Inmarsat A enters a new
Inmarsat satellite coverage:
*a. re-orient antenna with the satellite
b. contact the LES
c. call Inmarsat
47. Located in each ocean region which acts as a type of switch operator,
assigning,controlling and monitoring all of the telephone and telex
channels between the SESs and the CESs for its ocean region:
*a. Network coordination station
b. Coast Earth station
c. Network Control center
48. The horizontal movement of the antenna clockwise or counter clockwise
is called:
a. azimuth angle
*b. azimuth movement
c. azimuth limit
49. With the enhanced group call facility that inmarsat C provides the
number of ships which can receive the message being transmitted:

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*a. no limitation
b. has limitation
c. has specific number
50. Inmarsat terminal where facsimile facility is provided by LES thus there
is no need to have a FAX machine for message to be received in FAX form:
*a. Inmarsat-C
b. Inmarsat-B
c. Inmarsat-A
51. Inmarsat C terminal transmits information rate at:
a. 2,400 BPS
b. 50 BPS
*c. 600 BPS
52. What should be done to obtain access with the inmarsat system with the
use of Inmarsat-A:
a. Dial NCS ID
b. Dial NCC ID
*c. Dial LES ID
53. Inmarsat-A provides aside from telephony,facsimile,telex and:
*a. high speed data
b. low speed data
c. slow speed data
54. Inmarsat Duplex high speed data service which can be used for video
conferencing:
*a. 64 kbitsec.
b. 9.6 kbitsec.
c. 56 kbitsec.

55. Capable of receiving Maritime safety information automatically,just like
Inmarsat-C, in some navigational areas:
a. Sitor
*b. Navtex
c. Maritex
56. Inmarsat system/model which provide communication thru telephony,
facsimile, telex, high speed data:
a. Inmarsat-C
*b. Inmarsat-A
c. Inmarsat-P
57. A facility of inmarsat-A terminal which provides the length of time
Inmarsat system was used:
*a. call accounting
b. printer
c. print-out
58. Location of both the network control center and the satellite control
center:
a. Goonhilly southwest of england
*b. Inmarsat headquarters in london
c. Distributed in each ocean region
59. An inmarsat-A on board a vessel at pacific ocean addressed a call to
another inmarsat-A to a vessel in the indian ocean the process by which
the signal travels from one terminal to the other is called:
a. signal process
b. single hop
*c. double hop
60. An airplane, a vessel or a train equipped with inmarsat, mobile earth
station:
a. should not be in motion to received messages

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*b. could receive messages while in motion
c. redirect course to receive messages
61. Possible cause for inmarsat to decommission inmarsat-C terminal:
a. incorrect positioning of antenna
*b. incorrect operation
c. delayed log-in
62. A sub-system of inmarsat which connects the inmarsat satellites with the
landline telecommunications:
a. Satellite control center
*b. Coast Earth Station
c. Network co-ordinating center
63. Capable of receiving Maritime safety information near global
automatically:
a. SITOR
*b. Navtex
c. Inmarsat-C
64. What should be done when a vessel equipped with inmarsat-C enters a new

Inmarsat satellite area coverage:
a. re-orient the antenna
b. call the LES
*c. log-in with the NCS
65. The ship earth station is one of the components of inmarsat system which
can communicate with any landline fixed telecommunication firstly by:
a. getting an assignment from inmarsat
b. NCC control
*c. obtaining access with the system
66. What should be done when a vessel equipped with inmarsat-C enters
pacific ocean region after it leaves indian ocean region:
*a. log-out IOR and log-in POR
b. re-orient its antenna to POR
c. do nothing because the antenna is omni directional
67. Ocean code for telex in the atlantic ocean region-west:
*a. 584
b. 582
c. 583
68. Main purpose why must the inmarsat satellite have to maintain a speed
of 7,000 MPH:
*a. to maintain its geostationary orbit
b. to prevent the satellite from falling into the earth
c. to prevent the satellite from going to the moon

69. An inmarsat terminal whose toll charge is computed based on number of
Bps or kilobit:
a. inmarsat-A
*b. inmarsat-C
c. inmarsat-B
70. Ocean code for telex in the atlantic ocean region-east:

a. 584
b. 583
*c. 581
71. One of the characteristics of inmarsat-C terminal:
*a. half-duplex

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b. full duplex
c. triplex
72. As the earth rotates on its axis, the inmarsat satellites moves at 7,000
MPH to maintain its geostationary orbit. Nevertheless, intances takes
place where the satellites deviates from its assign fixed position. What
particular components of the inmarsat system whose function is to bring
back the satellite to its assigned fixed position:
*a. Satellite control center
b. Coast earth station
c. Network control center
73. When a telephone call is placed to a vessel equiped with Inmarsat-A to

gain access:
*a. use ocean code
b. use country code
c. use area code
74. Before a distress message is sent a priority call should be requested by:
*a. pressing the emergency button
b. placing a call with the LES
c. call inmarsat
75. Inmarsat maritime help line:
a. telex number 820325 INMHLP G
b. telex number 750659 INMHLP G
*c. telex number 920327 INMHLP G
76. Process by which inmarsat terminal is tested for the first time upon
installation before commercial operation could be done:
a. initialization
b. warning
*c. commissioning
77. Acronym for international maritime satellite organization:
*a. Inmarsat
b. Marisat
c. Inmarsator
d. none of the above
78. Inmarsat operates:
a. for profit
b. as a foundation
*c. not for profit
79. In sending message thru inmarsat-C the space in between words are:
a. free of charge
b. double charge
*c. counted as one character and are included in the charge

80. The lowest cost among all inmarsat terminals except inmarsat-P:
a. inmarsat-A
*b. inmarsat-M
c. inmarsat-C
81. An inmarsat system design which gave the Inmarsat-B terminal a better
quality than inmarsat-A:
a. digital
b. analogue
*c. full duplex
82. Inmarsat new generation satellites have a life span of:
*a. 10 years
b. 7 years
c. 15 years

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COMPILED BY:
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83. Inmarsat satellite provide data communication up to:
*a. 70 degrees N or S Latitude
b. 75 degrees N or S Latitude

c. 80 degrees N or S Latitude
84. Inmarsat-A terminal toll charge for telex, facsimile or high speed data
is based on:
*a. time length
b. characters
c. numbers or words
85. Strictly prohibited by inmarsat:
a. sell inmarsat terminal
b. failure to log-out
*c. sends false distress alarm
86. An inmarsat terminal which could receive messages stored for several
hours or days after logging in coming from in-operative period:
a. inmarsat-C
b. inmarsat-A
*c. inmarsat-B
87. An inmarsat terminal which will eventually replace inmarsat-A:
a. inmarsat-M
b. inmarsat-C
*c. inmarsat-B
88. Complete privacy or secured communication with the use of inmarsat
system is possible when:
a. one inmarsat terminal is on the other side of the communication.
b. when landbase communication sstem is connected with inmarsat.
*c. two inmarsat terminals are on both ends of the inmarsat communication
system.
89. The enhanced group call facility that inmarsat provides, ship addressed
but located in different ocean regions:
a. could receive message with slight delay after the other
*b. could receive message simultaneously
c. is not possible

90. In what orbit where the inmarsat satellites positioned 35,700 KM above
the equator:
a. low flying
*b. geostationary
c. fast orbit

91. With the use of inmarsat-A terminal the strenght of signal from the
satellite as could be seen from the EU or BDE depends upon:
a. the elevation angle from 05 degrees to 90 degrees N or S
b. the azimuth angle
*c. how the antenna had been focused with the satellite
92. With the use of Inmarsat-A telex facility, what sign gives you a signal
that you can send your telex thru the system:
*a. GA+
b. WRU
c. HR IS
93. In re-orienting the antenna of the inmarsat-A terminal auto track is not
advisable when the position of the vessel is:
a. at 5 degrees elevation angle
b. partly obstruct the antenna from either one of the satellites
*c. covered by overlapping satellites equi-distant to the vessel.

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COMPILED BY:
THRID MATE RODIEN E. PACA

94. In the absenceof electronic power or power failure from the generator
set, a 24 volts car battery can be a substitute to run an inmarsat
terminal. What is needed in order that a car battery could be used:
a. converter
b. transformer
*c. inverter
95. Ocean code for telephone in the atlantic ocean region-west:
a. 872
b. 873
*c. 874
96. Year when inmarsat-A terminal could no longer be used:
*a. 2006
b. 1999
c. 2005
97. Ocean code for telephone in the pacific ocean region:
*a. 872
b. 871
c. 873
98. There are navigational areas where there are two or three satellites
overlapping each other's coverage. Under this situation, the mariners
have the discretion to use:
a. no discretion but to use satellite where they were formerly oriented.
*b. any of the satellites.
c. no discretion but to use the satellite with the highest elevation
angle

99. Ocean code for telex in the pacific ocean region:
*a. 582
b. 581
c. 583
100.The electronic unit component of the inmarsat terminal is sometimes
referred to as:
a. ADE
*b. BDE
c. CDE

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