Element 7: GMDSS Radio Operating Practices

effective 8/01/2006

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7-A-065: INMARSAT-C Equipment and Operations

7-65I1: Which mode of communications is NOT possible through an Inmarsat-C SES?

Shore-to-ship Facsimile

Data

TELEX

Emergency Activation



7-65I2: 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.

All Inmarsat-C communications are made with real-time connectivity so there is no delay in message delivery.

Date/time notification of delivery is possible only through Inmarsat-B.

The average delivery time for a TELEX sent by Inmarsat-C is about 10 minutes, but fax and data messages sent by Inmarsat-C require about 30 minutes for delivery.



7-65I3: How is a signal radiated from an Inmarsat-C system's antenna?

It is radiated in an omni-directional pattern.

It is a highly focused directional signal that must be beamed at the desired satellite.

It is usually radiated in an omni-directional pattern, but an optional feature allows it to be directional for use when the vessel is on the fringe of the satellite's footprint.

It is radiated in an omni-directional pattern that can be reversed by the Operator to attain directional beaming to an alternate satellite.



7-65I4: 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.

There is a propagation delay, but a direct connection is made between the ship and shore users.

There are delays in establishing communications. Then a direct real-time connection is maintained with the other party.

The TELEX message is stored until the mailbox is accessed by the station desiring to retrieve their message.



7-65I5: With an Inmarsat-C CES, how are messages routed to receiving stations?

All messages are forwarded via a store and forward network.

Direct connections are made to the receiving stations via gateways.

Intermediary stations are used to connect the sending station with the receiving station in a real-time mode.

Messages are stored until the network is polled by the receiving station.



7-65I6: What are the directional characteristics of the Inmarsat-C SES antenna?

Omni-directional.

Highly directional parabolic antenna requiring stabilization.

Wide beam width in a cardioid pattern off the front of the antenna.

Very narrow beam width straight-up from the top of the antenna.





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