Element 7: GMDSS Radio Operating Practices

effective 8/01/2006

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7-A-078: INMARSAT Equipment Faults and Maintenance-2

7-78I1: What immediate remedy can be used to correct shadowing of the satellite signal by a shipboard obstruction?

Change the ship's course.

Relocate the mast or other obstruction.

Raise the transmit power level.

Increase the receiver gain.



7-78I2: A vessel loses Inmarsat-B SES operation after a large course change. Which of the following could cause this?

System loses gyro follow-up or a gyro system malfunction.

Shadowing of the SES antenna by clouds or other weather formations.

Misalignment of the shadow correction filter.

None of these



7-78I3: Which statement is correct regarding a method that a vessel experiencing problems with shadowing of the Inmarsat-B SES antenna by an on-board obstruction could use to attempt reliable communications?

Change course to make the communications.

Change the Coast Station ID programming.

Install a shadow correction filter.

Switch from TELEX to voice mode which requires lower signal strength for proper operation.



7-78I4: Which of the following conditions can render Inmarsat-B communications impossible?

All of these

An obstruction, such as a mast, causing disruption of the signal between the satellite and the SES antenna when the vessel is steering a certain course.

A satellite whose signal is on a low elevation, below the horizon.

Travel beyond the effective radius of the satellite.



7-78I5: A vessel is experiencing problems tracking the satellite in an Inmarsat-C SES. The problem could be:

All of these

Extremely heavy rain/snow storms.

Shadowing caused by an obstacle, such as a mast, between the SES antenna and the satellite.

The vessel is on the fringe of the coverage area of the satellite.



7-78I6: Which functions may the holder of a GMDSS Radio Operator License perform on the Inmarsat-C equipment?

All of these

Selection of CES.

Maintain the antenna clear of soot, paint, etc.

Logon, traffic and logoff functions.





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Element 7: GMDSS Radio Operating Practices
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7-A-079: MF-HF: Controls: Volume, Squelch, Power, Frequency & Mode