The NATO Broadcast and Ship to Shore (BRASS) HF service architecture defines how the alliance’s navies communicate across frequencies of 3-30MHz. BRASS is an HF protocol used for BLoS communications.
BRASS is being enhanced via the BRASS Enhancement-1 Technical Architecture, better known by the clumsy nested acronym of BRE1TA.
While SATCOM can carry BLoS traffic, HF provides ships with an alternative if satellite coverage is unavailable, or if SATCOM is jammed or compromised. HF technology dates back to the 1920s but it is still relied upon by navies and other armed services as an alternative to SATCOM.
To some extent,
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