Which of the following conditions does not typically impair Inmarsat-B communications?

Normal precipitation from gales and storms does not typically impair Inmarsat-B communications due to the system's design and engineering. Inmarsat satellite communications are specifically engineered to operate effectively in various weather conditions, including normal rain and storm-related precipitation.

The frequency range used by Inmarsat tends to be resilient to typical weather impacts. While heavy storms and severe weather can cause some degradation in signal quality, normal precipitation is usually within the system's operational tolerances, allowing for continued communication with minimal disruption.

In contrast, obstructions blocking the signal, low-elevation satellite signals, and traveling beyond the satellite's effective radius can significantly disrupt connectivity. These factors can cause significant signal loss or degradation, but normal levels of precipitation typically do not fall into the same category.