Which of the following is a functional or carriage requirement for compulsory vessels?

A compulsory vessel must satisfy certain equipment carriage requirements based on the intended sea area of operation.

There are different requirements for vessels with various groups of characteristics, so this general answer covers all without excluding any category by not being too specific.

For requirement details from IMO, see Safety regulations for different types of ships

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Which GMDSS communication functions must all compulsory vessels be capable of performing to meet International Maritime Organization requirements?

Distress alerting, general communications and receipt of Maritime Safety Information in the vessel's intended area of operation.

There are different requirements for vessels with various groups of characteristics, so this general answer covers all without excluding any category by not being too specific.

SENDING / RECEIVING
Distress alerts:

• SAR, search and rescue info
  
• Location signals
  
• At location info
  
• ship-to-shore
  
• shore-to-ship
  
• ship-to-ship
  

Also

• MSI, or maritime safety information;
  
• Bridge-to-bridge communications.
• General information
  

For more info, see International Mobile Satellite Organization article GMDSS

For requirement details from IMO, see Safety regulations for different types of ships

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GMDSS-equipped ships will be required to perform which of the following communications functions?

Transmit distress alerts, SAR and on-scene communications, MSI, Bridge-to-Bridge and general radio communications.

47 CFR § 80.1081 Functional requirements. Ships, while at sea, must be capable:

(a) Except as provided in §§ 80.1087(a)(1) and 80.1091(a)(4)(iii), of transmitting ship-to-shore distress alerts by at least two separate and independent means, each using a different radiocommunication service;

(b) Of receiving shore-to-ship distress alerts;

(c) Of transmitting and receiving ship-to-ship distress alerts;

(d) Of transmitting and receiving search and rescue co-ordinating communications;

(e) Of transmitting and receiving on-scene communications;

(f) Of transmitting and receiving signals for locating;

(g) Of transmitting and receiving maritime safety information;

(h) Of transmitting and receiving general radiocommunications to and from shore-based radio sytsems or networks; and

(i) Of transmitting and receiving bridge-to-bridge communications.

See Code of Federal Regulations 47 CFR § 80.1081

For more info, see International Mobile Satellite Organization article GMDSS

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What equipment can be used to receive Maritime Safety Information?

(A). NAVTEX, EGC receiver or HF SITOR (NBDP).

NAVTEX works on 518 kHZ to provide ships with direct printing service of meteorological forecasts, warning, urgent marine safety updates, and navigational information.

EGC Receiver, or Enhanced Group Call, is a internal part of the GMDSS. It is used for marine safety information, or MSI, usually outside of NAVTEX coverage area. The type of messages are like those for NAVTEX. EGC communicates with Inmarsat C system to send its messages.
See for more info, EGC Receiver

HF SITOR (NBDP) or SImplex Teletype Over Radio sends text messages. It is used on HF bands to send marine info about weather forecasts and meteorological warnings.

For more info see the US Coast Guard site for the article on Marine Safety Information Broadcasts

See National Geospatial-Intelligence Agency site Marine Safety Information

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Required GMDSS functions?

Bridge-to-Bridge communications, general communications, SAR communications.

SENDING / RECEIVING
Distress alerts:

• SAR, search and rescue info
  
• Location signals
  
• At location info
  
• ship-to-shore
  
• shore-to-ship
  
• ship-to-ship
  

Also

• MSI, or maritime safety information;
  
• Bridge-to-bridge communications.
• General information
  

For more info, see International Mobile Satellite Organization article GMDSS

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Which of the following are required GMDSS functions for vessels?

47 CFR § 80.1081 Functional requirements. Ships, while at sea, must be capable:

(a) Except as provided in §§ 80.1087(a)(1) and 80.1091(a)(4)(iii), of transmitting ship-to-shore distress alerts by at least two separate and independent means, each using a different radiocommunication service;

(b) Of receiving shore-to-ship distress alerts;

(c) Of transmitting and receiving ship-to-ship distress alerts;

(d) Of transmitting and receiving search and rescue co-ordinating communications;

(e) Of transmitting and receiving on-scene communications;

(f) Of transmitting and receiving signals for locating;

(g) Of transmitting and receiving maritime safety information;

(h) Of transmitting and receiving general radiocommunications to and from shore-based radio sytsems or networks; and

(i) Of transmitting and receiving bridge-to-bridge communications.

See Code of Federal Regulations 47 CFR § 80.1081

For more info, see International Mobile Satellite Organization article GMDSS

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