Scope

This Recommendation describes an MF radio system, referred to as navigational data (NAVDAT), for use in the maritime mobile service, operating in the 500 kHz band for digital broadcasting of maritime safety and security related information from shore-to-ship. The operational characteristics and system architecture of this radio system are included in Annexes 1 and 2. Technical characteristics and transmission structure are detailed in Annexes 3 and 4. Message file structure and a broadcast mode are introduced in Annexes 5 and 6. The list of subject messages is in Annex 7. Annex 8 provides information on the implementation of the NAVDAT shore infrastructure.