When Inmarsat-B and Inmarsat-C terminals are compared?

The correct choice highlights key characteristics of Inmarsat-C terminals. Inmarsat-C antennas are indeed smaller in size compared to Inmarsat-B, making them suitable for compact installations where space is a limitation. Additionally, Inmarsat-C employs passive non-parabolic antennas, which means they do not require complex tracking mechanisms to function effectively. This is in contrast to other systems that may utilize active antennas, which require more power and potentially more complexity in design and maintenance.

The aspect of the antennas not having rewind capability is also significant. Inmarsat-C terminals are designed for simple and reliable operation, which aligns with the passive nature of their antennas. This simplicity is a primary reason why these terminals are widely used for various marine and land-based communication applications.

Understanding these distinctions is vital for those involved in maritime communications, as it informs choices about equipment based on size constraints, operational needs, and the type of communications services that are required.