Element 7: GMDSS Radio Operating Practices

effective 8/01/2006

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7-A-067: Compare & Differentiate "B" & "C" Terminals

7-67I1: Which statement concerning Inmarsat-B and Inmarsat-C terminals is correct?

Both Inmarsat-B and Inmarsat-C units can send data as well as send messages to fax machines.

Both Inmarsat-B and Inmarsat-C units are capable of fax and voice communications.

Inmarsat-B units are not capable of data communications, but Inmarsat-C units are capable of data communications.

None of the above



7-67I2: When Inmarsat-B and Inmarsat-C terminals are compared:

None of the above

Inmarsat-B antennas are bulkier, but omni-directional, while Inmarsat-C antennas are smaller and parabolic, for aiming at the satellite.

Inmarsat-B antennas are parabolic and smaller for higher gain, while Inmarsat-C antennas are larger but omni-directional.

Inmarsat-C antennas are smaller, but omni-directional, while Inmarsat-B antennas are parabolic for lower gain.



7-67I3: Which statement concerning Inmarsat-B and Inmarsat-C terminals is correct?

Inmarsat-B terminals require AZ/EL setup and gyro input, in order to enable automatic satellite tracking.

Inmarsat-B terminals require gyro and GPS input, in order to enable automatic satellite tracking.

Inmarsat-C terminals require only GPS input, in order to enable automatic satellite tracking.

Inmarsat-C terminals require AZ/EL setup and GPS input, in order to enable automatic satellite tracking.



7-67I4: When Inmarsat-B and Inmarsat-C terminals are compared:

Inmarsat-C antennas are smaller, with passive non-parabolic antennas but no rewind capability.

Inmarsat-C antennas are smaller, with active parabolic antennas but no rewind capability.

Inmarsat-B antennas are larger, with passive non-parabolic antennas that require rewind capability.

Inmarsat-B antennas are larger, with stationary parabolic antennas but no rewind capability.



7-67I5: Which statement concerning Inmarsat-B and Inmarsat-C terminals is correct?

Both Inmarsat-B and Inmarsat-C units are subject to shadowing effects, but Inmarsat-B units have directional antennas.

Both Inmarsat-B and Inmarsat-C units are subject to shadowing effects due to their omni-directional antennas.

Both Inmarsat-B and Inmarsat-C units are subject to shadowing effects, but Inmarsat-C units have directional antennas.

Both Inmarsat-B and Inmarsat-C units are subject to shadowing effects, due to their directional antennas.



7-67I6: When Inmarsat-B and Inmarsat-C terminals are compared:

Inmarsat-B units provide greater communications capabilities, with the trade-offs of greater size, weight, installation expense and initial cost.

Inmarsat-B units provide greater communications capabilities, with the benefits of greater size, weight, installation expense and initial cost.

Inmarsat-C provides lesser communications capabilities, with the trade-offs of greater size, weight, installation expense and initial cost.

Inmarsat-C units are of smaller size/weight, installation expense and initial cost and provide greater communications capabilities due to modern technology.





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7-A-066: INMARSAT-C Equipment and Operations
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Element 7: GMDSS Radio Operating Practices
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7-A-068: Selecting C.E.S. & C.E.S. ID #