USCG-ROR-L3.4

Sound signals: equipment and restricted visibility (Rules 33, 35; Annex III)

USCG-ROR-M3 · Lights, shapes and sound signals · USCG-ROR-M3-A Power-driven, towing and pushing, special vessels, anchored barges and restricted-visibility signals: every Inland difference.

Fog signals match almost exactly. The differences are **constrained by draft**, **fishing and RAM at anchor**, and the **special anchorage** exemption.

AI-drafted catalogue content pending SME review. The Rules of the Road examination is the one module where a near miss fails you, and module assignments and pass marks are set by NMC examination policy rather than regulation; verify with the National Maritime Center before booking an exam or relying on any figure here.