Over what system are Enhanced Group Calls transmitted?

(B). Inmarsat satellite

Per US Coast Guard, the EGC (Enhanced Group Call) is a functionality of the Inmarsat C satellite system. It is used to send messages to specific ships in a certain area.

For more info, please see US Coast Guard article on MARCOMMS - INMARSAT C SAFETYNET

For comprehensive info, please see Inmarsat's INTERNATIONAL SAFETYNET HANDBOOK

COSPAS is part of the COSPAS-SARSAT Search and Rescue System

SITOR is for radio-based texting See Wikipedia SITOR (SImplex Teletype Over Radio)

NAVTEX is just the naval telex system. Wikipedia NAVTEX (NAVigational TEleX)

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How is a MSI (Maritime Safety Information) broadcast received by an Inmarsat-C SES that is engaged in communications?

(C). There is no loss of information since broadcasts of "vital" messages will be repeated.

For some of the EGC (Enhanced Group Call) receivers lack error-less receipt of messages function. So, messages are repeated to ensure that they are received properly.

Two types of MSI communications are repeated: unscheduled messages (distress and severe weather notifications) and scheduled transmissions (warnings and other info).

For more info, see section 9 "REPEAT BROADCASTS OF MSI INFORMATION" of the Inmarsat INTERNATIONAL SAFETYNET HANDBOOK

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Which of the following provides a unique automated system capable of addressing messages to predetermined groups of ships or all vessels in both fixed and variable geographic areas?

(D). EGC

Per US Coast Guard, the EGC (Enhanced Group Call) is a functionality of the Inmarsat C satellite system. It is used to send messages to specific ships in a certain area.

For more info, please see US Coast Guard article on MARCOMMS - INMARSAT C SAFETYNET

For comprehensive info, please see Inmarsat's INTERNATIONAL SAFETYNET HANDBOOK

NAVTEX is just the naval telex system. Wikipedia NAVTEX (NAVigational TEleX)

AFRTS (ha ha ha - somebody had fun) is the Armed Forces Radio Service (AFRS). Wikipedia American Forces Network

NAVAREAs are defined areas providing weather and navigation information. Wikipedia NAVAREA

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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?

(A). EGC

Per US Coast Guard, the EGC (Enhanced Group Call) is a functionality of the Inmarsat C satellite system. It is used to send messages to specific ships in a certain area.

For more info, please see US Coast Guard article on MARCOMMS - INMARSAT C SAFETYNET

For comprehensive info, please see Inmarsat's INTERNATIONAL SAFETYNET HANDBOOK

NAVTEX is just the naval telex system. Wikipedia NAVTEX (NAVigational TEleX)

AMVER is the automated mutual assistance vessel rescue. Wikipedia AMVER

DSC stands for digital selecting calling in marine communications. Wikipedia Digital selective calling

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What services are available through Enhanced Group Calls?

(D). Maritime Safety Information and messages to pre-defined groups of subscribers.

Two types of MSI communications are repeated: unscheduled messages (distress and severe weather notifications) and scheduled transmissions (warnings and other info).

For more info, see section 9 "REPEAT BROADCASTS OF MSI INFORMATION" of the Inmarsat INTERNATIONAL SAFETYNET HANDBOOK

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What messages originate from registered information providers anywhere in the world and are broadcast to the appropriate ocean region via a LES?

(A). SafetyNETTM messages

LES is land earth station, a registered with Inmarsat info provider, uses SafetyNET(tm).

For more details in section 3.1 from Inmarsat, see INTERNATIONAL SAFETYNET HANDBOOK

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