GMDSS. FCC Test 47 – Online Maritime Tests

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

Extremely heavy rain/snow storms.
All of these.
The vessel is on the fringe of the coverage area of the satellite.
Shadowing caused by an obstacle, such as a mast, between the SES antenna and the satellite.

MF/HF Transceiver Power levels should be set:

To the level necessary to maximize the propagation radius.
Both a
To the lowest level necessary for effective communications.
To the highest level possible so as to ensure other stations cannot 'break-in' on the channel during use.

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

Install a shadow correction filter.
Change the Coast Station ID programming.
Switch from telex to Voice mode which requires lower signal strength for proper operation.
Change course to make the communications.

What immediate remedy can be used to correct shadowing of the satellite signal by a shipboard obstruction?

Change the ship's course.
Increase the receiver gain.
Relocate the mast or other obstruction.
Raise the transmit power level.

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

Logon, traffic and logoff functions.
All of these.
Maintain the antenna clear of soot, paint, etc.
Selection of CES.

Which functions may the holder of a GMDSS Radio Operator License NOT perform on the Inmarsat-C equipment?

Entry of position data and selection of CES.
Maintain the antenna clear of soot, paint, etc.
Logon, traffic and logoff functions.
Optimize performance by adjusting the transmitter EIRP.

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

System loses gyro follow-up or a gyro system malfunction.
Misalignment of the shadow correction filter.
None of these.
Shadowing of the SES antenna by clouds or other weather formations.

Which of the following conditions can render Inmarsat-A 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.

What maintenance function may the holder of a GMDSS Radio Operator license perform, or supervise the performance of, on an Inmarsat-C SES?

Painting the radome.
Adjust any front panel controls.
Adjust the station's EIRP.
Adjust a reference oscillator or synthesizer.

Review Answers