Amendment 1 made the following necessary updates:

-  added test procedures for 406 MHz PLBs with multi-constellation GNSS receiver modules, and

-  aligned the AIS identifier, where relevant, to reflect that PLBs are types of EPIRB in accordance with ITU-R M.633, and

-  align AIS transmitted text, if fitted, to reflect that PLBs are types of EPIRB in accordance with ITU-R M.633, and

-  some minor editorial corrections.

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