Which of the following would indicate an Inmarsat-C terminal?

Inmarsat-C terminals are designed for satellite communications and utilize specific number sequences known as Maritime Mobile Service Identity (MMSI) numbers. The correct choice indicates an Inmarsat-C terminal based on its adherence to MMSI number formatting.

The key to identifying an Inmarsat-C terminal lies in the first few digits of the MMSI number. The identification of an Inmarsat-C terminal typically begins with specific prefixes which relate to its designated service. For option A, the number starts with "436", which is characteristic of Inmarsat-C terminals. This prefix signifies that the terminal is part of the Inmarsat satellite communication system.

In contrast, the other options do not start with this specific prefix, making them invalid for identifying an Inmarsat-C terminal. The distinctions in the prefixes and formats of MMSI numbers ensure that each type of communication terminal can be correctly identified. This understanding is essential when operating equipment under the GMDSS and ensuring compliance with maritime communications standards.