Scope

This Recommendation describes an HF radio system, referred to as Navigational Data HF (NAVDAT HF), for use in the maritime mobile service, operating in the frequency bands of Appendix 17 of the Radio Regulations (RR) 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 frequencies listed in Annex 7, which belong to RR Appendix 17, should be utilized for operating the NAVDAT HF system. The list of subject messages is on Annex 8.

The NAVDAT HF is complementary to the NAVDAT 500 kHz, described in Recommendation ITU‑R M.2010 in terms of radio coverage.