QUESTION 4.1.15

Sound-signalling equipment

Oil, Chemical, LPG, LNGBridge

What is being checked

The inspector is checking whether the whistle, bell and gong arrangements can produce the required manoeuvring, warning, restricted-visibility, anchor and distress signals, with officers able to configure, cross-check, test and respond to failure of the actual equipment fitted.

Ready onboard

0/6 complete

PROCEDUREThe company procedure defines safe use, testing, limitations and failure response for sound-signalling equipment.CONFIGURATIONAutomatic fog-signal timing, manual controls, whistle selection and vessel-length-dependent signal arrangements are correctly understood and set.FUNCTION TESTTest manual and automatic controls, timing, audible output and alternate station, and inspect bell, gong, striker and emergency power as fitted.FOG SIGNALSOfficers can select the signal for power-driven, not-under-command, restricted, towing and anchor conditions.BELL AND GONGRequired equipment is accessible, secured and capable of manual use.RECORDPeriodic tests and any operational use in restricted visibility are logged under company procedure.

Practice questions

Answer aloud, then open the preparation point.

1What safety function does sound-signalling equipment provide?

The whistle, bell and gong arrangements can produce the required manoeuvring, warning, restricted-visibility, anchor and distress signals.

2How is the complete function tested?

Test manual and automatic controls, timing, audible output and alternate station, and inspect bell, gong, striker and emergency power as fitted.

3What is its principal limitation?

Sound can be masked by wind, machinery and bridge enclosure; automatic fog signals do not remove the requirement for safe speed, lookout and radar use.

4What is your response if it fails?

Use alternate controls or portable means where lawful, strengthen navigation precautions, notify the Master and repair the statutory equipment.

5Show the latest test and operational evidence.

Link the dated record to the actual unit, test method, result, defect response and restoration; a panel lamp test alone is not sufficient where the full signal path can be tested.

Where an observation may arise

PROCEDURE UNKNOWN

The responsible officer cannot explain safe use, limitations or failure response.

TEST INCOMPLETE

Testing does not prove the required operational function or remote indication.

WRONG SIGNAL

The automatic sequence does not match the vessel's status.

TIMING ERROR

Signal duration or interval is incorrect.

ACCESS

Bell, gong or manual controls are missing, seized or inaccessible.

Master's practical note

Ask for the signal required in the vessel's present condition, then verify the selector. Familiarity with one common fog signal does not prove knowledge of anchor or restricted statuses.

Equipment boundary and references

Equipment boundary: Signal requirements depend on vessel length and condition under COLREG. Testing near port or personnel must be announced and controlled to avoid hazard or confusion.

References

OCIMF SIRE 2.0 Question Library Part 1, Version 1.0, Question 4.1.15
COLREG rules 32 to 37 and Annex III
SOLAS Chapter V
ICS Bridge Procedures Guide

Last reviewed: 2026-09-11