VHF (Very High Frequency) radio is the primary short-range voice communication system used aboard ships, essential for navigation safety, port operations, and distress communication.
Key VHF Channels
- Channel 16 — the international distress, safety, and calling frequency, continuously monitored by ships and coast stations; used to initiate contact before switching to a working channel
- Channel 13 — bridge-to-bridge navigational communication between vessels
- Channel 70 — reserved for DSC (Digital Selective Calling) distress alerting, not voice communication
- Port-specific working channels, assigned by local VTS or port control for routine communication within that port area
Why VHF Matters for Navigation Safety
Direct bridge-to-bridge communication via VHF allows vessels approaching each other in a close-quarters situation to clarify intentions — though COLREGs compliance and proper lookout remain the primary means of collision avoidance, with VHF as a supplementary tool, not a substitute for correct navigational action.
GOC/ROC Certification
Operating VHF and other GMDSS radio equipment requires a GOC (General Operator’s Certificate) or ROC (Restricted Operator’s Certificate) — a specific, mandatory qualification distinct from general deck/engine competency certificates.
Radio Discipline
Proper radio procedure — clear, concise transmissions, correct use of vessel identification, and avoiding unnecessary chatter on working channels — is a real operational skill, particularly important in busy traffic areas where multiple vessels are communicating simultaneously.
Exam Relevance
VHF channel usage, radio procedure, and GMDSS communication protocols are core topics in GOC/ROC certification and deck officer competency exams.