Which statement concerning Inmarsat-B and Inmarsat-C terminals is correct?
Official USCG Answer & Rule Citation
Correct Answer: Option C — Inmarsat-B terminals require AZ/EL setup and gyro input, in order to enable automatic satellite tracking.
Inmarsat-B terminals require high-gain, directional antennas that must actively track the satellite. This necessitates gyro input for heading and GPS input for position to calculate the correct Azimuth and Elevation (AZ/EL) angles. Inmarsat-C, being omni-directional, does not require this complex mechanical tracking or AZ/EL setup.
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