Upgrade to remove ads
Only $2.99/month

Quiz 6: INMARSAT Set-Up

Terms in this set (78)

Where NAVTEX cannot be feasibly established, what system can be implemented to provide an automated service in coastal waters to receive MSI?
SafetyNETTM
What action should a GMDSS Radio Operator take when SafetyNETTM Distress or Urgency messages are received by the vessel's EGC receiver?
Aural and/or visual alarms are activated and require manual deactivation.
What system can provide an automated service in coastal waters where it may not be feasible to establish the NAVTEX service or where shipping density is too low to warrant its implementation?
SafetyNETTM
Aboard ship, SafetyNETTM messages can be received by which equipment methods?
EGC receiver of the vessel's Inmarsat-C SES.
SafetyNETTM messages can be received by which of the following shipboard equipment?
Inmarsat-C EGC receiver
Maritime Safety Information is promulgated via satellite through which system?
SafetyNETTM
SafetyNETTM promulgates what type of information?
MSI
What kinds of broadcasts are not available through SafetyNETTM?
Vessel traffic lists
Which satellite system promulgates Maritime Safety Information?
Inmarsat-C SafetyNETTM
What information is promulgated by the international SafetyNETTM?
MSI
To receive all mandatory MSI using the SafetyNETTM system the vessel must:
Log-in and ensure the position is accurate to receive MSI for the NAVAREA the vessel is currently within.
In using SafetyNETTM for the receipt of MSI (Maritime Safety Information):
All of these answers are correct (Only unscheduled Urgency and Distress messages will be received if the Inmarsat-C SES is not logged in, Both scheduled MSI and unscheduled Urgency and Distress messages will be received if the Inmarsat-C SES is logged in, The Inmarsat-C SES must have Enhanced Group Calling (EGC) capability to receive MSI.)
Over what system are Enhanced Group Calls transmitted?
Inmarsat satellite
How is a MSI (Maritime Safety Information) broadcast received by an Inmarsat-C SES that is engaged in communications?
There is no loss of information since broadcasts of "vital" messages will be repeated.
Which of the following provides a unique automated system capable of addressing messages to pre-determined groups of ships or all vessels in both fixed and variable geographic areas?
EGC
What system may be useful for messages, such as local storm warnings or a shore-to-ship Distress alert, for which it is inappropriate to alert all ships in the satellite coverage area?
EGC
What services are available through Enhanced Group Calls?
Maritime Safety Information and messages to pre-defined groups of subscribers.
What messages originate from registered information providers anywhere in the world and are broadcast to the appropriate ocean region via a LES?
SafetyNETTM messages
Which of the following actions should be taken once the vessel is berthed and will not leave port again for several weeks?
The GMDSS Radio Operator may log out of the Inmarsat-C system and turn the power off (unless the vessel decides to leave the unit on during the port stay.)
What action should always be taken before powering down an Inmarsat-C terminal or leaving one satellite footprint for another?
Log out with the current NCS to inform them you are off the air or to enable a proper log in procedure with the new satellite.
With most Inmarsat-C systems what should the indicator lamps do when powering up?
All lamps should illuminate in a particular sequence, as per the operator's manual.
What is the importance of a successful log in indication, after power-up, on an Inmarsat-C terminal?
The terminal is enabled for routine incoming and outbound traffic.
On an Inmarsat-C system, what is the importance of a successful "SYNC" indication after power up?
Sufficient signal strength on the NCS common channel is being received.
On an Inmarsat-C system an incoming EGC alarm sounds:
To draw the operator's attention to an unscheduled Distress or Urgency message.
Which satellite(s) would most likely be selected for use when the vessel is operating off the eastern shore of the United States?
AOR-W
Which satellite should be chosen when operating in the Eastern Gulf of Mexico?
AOR-W
Which longitude corresponds to the AOR-W satellite for Inmarsat-B/C communications?
54W
Which longitude corresponds to the AOR-E satellite for Inmarsat-B/C communications?
15.5W
Which longitude corresponds to the POR's satellite location for Inmarsat-B/C communications?
178E
Which longitude corresponds to the IOR's satellite location for Inmarsat-B/C communications?
64E
Which action must be taken to ensure that incoming message traffic of all priority levels will be received through Inmarsat-C?
The GMDSS Radio Operator must log-in to the desired satellite (if the unit did not automatically do so.)
When logging into the Inmarsat system using Inmarsat-C, it is necessary to:
Select the Ocean Region.
What action should be taken on changing from one ocean region to another?
Log out of the current satellite and log in to the correct satellite.
What is the primary danger of improperly logging out?
Your company or another ship may accrue significant charges when their traffic is repetitively sent to your unavailable terminal.
Which of these can take place on an Inmarsat-C terminal that has synch with the NCS CC but has not yet performed a successful login?
Reception of unscheduled MSI Urgency and Distress messages.
Which of the following is not an example of a failure to log-out properly?
A message on the screen or printer from the NCS.
What is the primary function of an NCS?
To monitor and control communications through the Inmarsat satellite for which it is responsible.
What is the primary function of a LES?
To provide direct communications between the Inmarsat station placing a call and the station receiving the call.
Messages are transmitted by an Inmarsat LES according to what criteria?
Priority
How is maximum coverage provided by satellites in the maritime satellite service?
Four satellites in geo-stationary orbit approximately 22,184 miles above the equator.
What is meant by the characters GA+ on an Inmarsat terminal?
Go ahead for live telex operations.
What is the purpose of a CODEC?
To convert analog voice signals to digital transmissions.
What is an MRN?
Message Reference Number, provided by the LES.
To keep the Inmarsat-B or F77 antenna pointing at the desired satellite, regardless of the ship's position and course, it has an input from the vessel's:
Gyrocompass
The Inmarsat telephone and TELEX communications channel usage scheme is:
One ship per telephone channel and many ships per TELEX channel.
What is an "Inmarsat Mobile Number"?
This is the Inmarsat number that is assigned to a unit for incoming or outgoing calls.
Which of the following statements concerning Inmarsat geostationary satellites is true?
They provide coverage to vessels in nearly all of the world's navigable waters.
What is the primary purpose of an Inmarsat LES?
The LES makes the satellite connection between the vessel and the requested destination for all types of services.
Which mode of communications is NOT possible through an Inmarsat-C SES?
Shore-to-ship Facsimile
What is the average length of time required for a TELEX sent by Inmarsat-C to be delivered to the addressee?
The average delivery time for a message sent by Inmarsat-C is about 10 minutes.
How is a signal radiated from an Inmarsat-C system's antenna?
It is radiated in an omni-directional pattern.
What statement is true regarding Inmarsat-C?
This is a store and forward network, with an intermediate step that means there is no direct connection between ship and shore users.
With an Inmarsat-C LES, how are messages routed to receiving stations?
All messages are forwarded via a store and forward network.
What are the directional characteristics of the Inmarsat-C SES antenna?
Omni-directional.
Which of the following best describes Inmarsat-C operation?
Is a digital store-and-forward system that also provides Enhanced Group Call, data reporting, polling and Distress alerting capabilities.
Which of the following best describes a shipboard Inmarsat-C system?
A small, lightweight terminal capable of providing satellite store-and-forward message communications.
Which of the following modes of communications are available when using Inmarsat-C?
TELEX and e-mail
Which mode of communication is possible through an Inmarsat-C SES?
TELEX and e-mail
It is possible to transmit all of the following via Inmarsat-C from a vessel except?
Voice
Which of the following best describes the full range of services provided by the Inmarsat-C Satellite system?
Polling, enhanced group call, one-way position and data reporting via satellite, two-way messaging and data communications on a store-and-forward basis.
Which statement concerning Inmarsat-B and Inmarsat-C terminals is correct?
Both Inmarsat-B and Inmarsat-C units can send data as well as send messages to fax machines.
When Inmarsat-B and Inmarsat-C terminals are compared:
Inmarsat-B antennas are larger, but directional for higher gain, while Inmarsat-C antennas are smaller and non-parabolic, and do not require aiming at the satellite.
Which statement concerning Inmarsat-B and Inmarsat-C terminals is correct?
Inmarsat-B terminals require AZ/EL setup and gyro input, in order to enable automatic satellite tracking.
When Inmarsat-B and Inmarsat-C terminals compared:
Inmarsat-C antennas are smaller, with passive non-parabolic antennas but no rewind capability.
Which statement concerning Inmarsat-B and Inmarsat-C terminals is correct?
Both Inmarsat-B and Inmarsat-C units are subject to shadowing effects, but Inmarsat-B units have directional antennas.
When Inmarsat-B and Inmarsat-C terminals are compared:
Inmarsat-B units provide greater communications capabilities, with the trade-offs of greater size, weight, installation expense and initial cost.
Which statement is false regarding an Inmarsat Distress request?
Any Distress request is automatically switched to an Inmarsat Distress working frequency.
In what way(s) may a Distress message be initiated through Inmarsat?
By pressing dedicated key(s) for this purpose or using menu-driven features to produce a Distress priority message.
How is an Inmarsat Distress priority message ordinarily initiated on board the vessel?
By pressing one or more dedicated "Distress key" controls on the equipment.
What must be done to disconnect an incoming TELEX message when voice Distress communications is desired via Inmarsat-B?
Depressing the "Distress" button automatically disconnects incoming messages.
Why is the correct selection of the LES in the Distress Alert Setup menu so crucial?
The LES choice determines the nationality of the RCC which will handle the Distress traffic and perform SAR duties or that will pass the particulars to the RCC with jurisdiction to coordinate the SAR situation.
If an Inmarsat Distress Alert Setup menu contains an incorrect or unavailable LES code what happens to the Distress Alert transmission?
The NCS will step in and route the Distress Alert transmission to an RCC.
Upon receipt of SafetyNETTM messages of the Distress or Urgency category on the ship's EGC reciever, what action is required by the GMDSS Radio Operator?
Manually reset the alarm.
What can be defined as the service that allows terrestrial information providers to send general information messages to pre-defined groups of subscribers?
FleetNETTM
What additional equipment provides the maximum availability for receiving SafetyNETTM broadcasts when the associated Inmarsat-C SES is engaged in communications?
A separate EGC receiver.
Which of the following is utilized to transmit Enhanced Group Calls?
Inmarsat Satellite
What is the equipment arrangement that provides the maximum availability for reception of MSI broadcasts when using Inmarsat-C for TELEX communications?
Separate EGC receiver.
Which of the following statements concerning EGC configuration is false?
The originator of MSI information cannot specify receipt only by vessels within a specific geographical area, circular or rectangular.
THIS SET IS OFTEN IN FOLDERS WITH...