5.3 Standard Marine Procedural Words (Prowords: Over, Out, Roger, Say Again, Read Back)

5.3 Standard Marine Procedural Words (Prowords: Over, Out, Roger, Say Again, Read Back)

Radio communication differs fundamentally from everyday telephone or face-to-face conversation. On a VHF radio channel, only one station can transmit effectively at any given instant (simplex operation). If two operators speak simultaneously, their signals collide, producing an unreadable squeal known as "heterodyning" or channel drowning.

To manage conversation flow, minimize airtime, and prevent critical errors, maritime radio rules enforce the use of Procedural Words (Prowords). These are precise, internationally standardized words or short phrases that carry mandatory operational meanings.

Understanding prowords and adhering strictly to standard marine terminology is a core requirement for passing the RYA Short Range Certificate (SRC) practical voice examination.

Core Transmission Control Prowords: OVER & OUT

The most important prowords for controlling conversation flow are OVER and OUT. They inform all listening stations who controls the channel and whether the exchange is continuing or finished.

The Cardinal Sin of Maritime Radio: "Over and Out"

One of the most common mistakes made by novice radio operators—often influenced by television and movies—is combining these two commands into "Over and Out".

CRITICAL RYA EXAM RULE: NEVER say "Over and Out".

Why? The two prowords are direct opposites. OVER means "I am waiting for your reply," whereas OUT means "I am closing the station and will not listen for a reply." Saying both simultaneously is logically contradictory and confuses channel control. Using "Over and Out" on an RYA SRC exam will result in an immediate error deduction.

Acknowledgement & Compliance Prowords

When acknowledging messages, operators must distinguish between simply receiving information and agreeing to carry out an instruction.

• ROGER: "I have received your last transmission satisfactorily."
  • Important Constraint: ROGER means receipt only. It does not mean "yes", it does not mean "I agree", and it does not mean "I will comply". It simply confirms that the radio signal was heard and understood.
• WILCO: "I understand your message and WILL COMPLY with your instruction."
  • Operational Rule: WILCO is used when responding to a direct order or instruction from a coastguard station, harbour master, or vessel traffic service (VTS).
  • Because WILCO inherently includes receipt of the message, saying "Roger Wilco" is redundant and improper. Use WILCO by itself.
• RECEIVED: Used primarily in formal distress/urgency acknowledgements (e.g., "MAYDAY RECEIVED").

Repetition & Verification Prowords

When parts of a message are garbled or need verification, specific prowords must be used to request or perform repetitions.

• SAY AGAIN: "Repeat your transmission (or specified portion)."
  • Examples: "Say again position, OVER" or "Say again all after vessel name, OVER."
  • THE 'REPEAT' FORBIDDEN RULE: Never use the word "REPEAT" in marine VHF. In international radio protocol (derived from naval artillery procedures), "REPEAT" is an explicit command to fire another artillery volley at the same coordinates. The only correct phrase on marine VHF is SAY AGAIN.
• I SAY AGAIN: "I am repeating my transmission (or portion indicated)."
  • Used when clarifying a previously sent message or emphasizing critical numbers: "Position 50 degrees 45 minutes North, I SAY AGAIN, 50 degrees 45 minutes North."
• READ BACK: "Repeat this entire message back to me exactly as received."
  • Used by coastguards or VTS when transmitting vital safety instructions, fairway clearances, or waypoint coordinates to ensure zero transmission errors.

Correction, Spelling & Identification Prowords

Complete Maritime Proword Reference & Exam Summary

To summarize the rules for the RYA SRC practical assessment:

1. End every intermediate spoken phrase with OVER when awaiting a reply.
2. End the final phrase of a completed call with OUT (and never combine with OVER).
3. Use SAY AGAIN to request repetitions; never say "Repeat".
4. Use ROGER for receipt, WILCO for compliance, and avoid combining them.
5. Use CORRECTION immediately upon making a spoken mistake to rectify the record.

Sample Compliant VHF Exchange (VTS Clearance):

Vessel:     "Solent VTS, Solent VTS, this is Motor Yacht Bluefin, MAB34, OVER."
VTS:        "Bluefin, Solent VTS, pass north of Bramble Buoy and report entering fairway, OVER."
Vessel:     "Solent VTS, Bluefin, WILCO. Will pass north of Bramble Buoy and report fairway, OUT."

This short exchange demonstrates flawless proword usage: the vessel confirms compliance using WILCO and closes the channel cleanly using OUT.