ITU-R M.2058-0 PDF

This Recommendation describes an HF radio system, named Navigational Data HF (NAVDAT HF), for use in the maritime mobile service, operating in the frequency bands of Appendix 17 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. The two different modes of broadcasting data are detailed in Annexes 3 and 4. The NAVDAT HF is complementary to the NAVDAT 500 kHz, described in Recommendation ITU-R M.2010 in terms of radio coverage.