Which condition can render INMARSAT-B communications impossible?

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Multiple Choice

Which condition can render INMARSAT-B communications impossible?

Inmarsat-B relies on a clear line-of-sight to a satellite within that satellite’s footprint. The footprint is the area on Earth where the satellite’s signal is strong enough to maintain a link. If you travel beyond the satellite’s effective radius, you’re outside that coverage area, so there’s no path to the satellite at all and the communication cannot be established. Temporary obstructions, like a mast, can cause interruptions or degrade the signal, but the link can often be restored by changing course or adjusting the antenna once the obstruction is cleared. A satellite that appears low on the horizon may reduce signal quality or require the receiver to switch to a different satellite, but it isn’t an absolute, permanent impossibility as long as the system can reacquire a usable path within the coverage area or with a different satellite. Therefore, the scenario that guarantees impossibility is staying outside the satellite’s footprint—the effective radius.

Inmarsat-B relies on a clear line-of-sight to a satellite within that satellite’s footprint. The footprint is the area on Earth where the satellite’s signal is strong enough to maintain a link. If you travel beyond the satellite’s effective radius, you’re outside that coverage area, so there’s no path to the satellite at all and the communication cannot be established.

Temporary obstructions, like a mast, can cause interruptions or degrade the signal, but the link can often be restored by changing course or adjusting the antenna once the obstruction is cleared. A satellite that appears low on the horizon may reduce signal quality or require the receiver to switch to a different satellite, but it isn’t an absolute, permanent impossibility as long as the system can reacquire a usable path within the coverage area or with a different satellite. Therefore, the scenario that guarantees impossibility is staying outside the satellite’s footprint—the effective radius.

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