Daylight signalling lamp
What is being checked
The inspector is checking whether a portable or fixed signalling lamp can attract attention and transmit visual signals in daylight and darkness independently of the ship's main electrical supply, with officers able to configure, cross-check, test and respond to failure of the actual equipment fitted.
Ready onboard
0/6 completePractice questions
Answer aloud, then open the preparation point.
1What safety function does daylight signalling lamp provide?
A portable or fixed signalling lamp can attract attention and transmit visual signals in daylight and darkness independently of the ship's main electrical supply.
2How is the complete function tested?
Operate the lamp safely on main and independent power, check beam and signalling control and verify battery charge and endurance under the approved test.
3What is its principal limitation?
Beam visibility depends on accurate aiming, daylight conditions, weather, battery condition and operator familiarity with Morse signalling.
4What is your response if it fails?
Use another approved visual or radio means, report the defect and restore lamp and independent power readiness.
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
The responsible officer cannot explain safe use, limitations or failure response.
Testing does not prove the required operational function or remote indication.
The independent power source is discharged or missing.
Cable, shutter, sight or required spare component is defective.
Officers cannot aim or transmit a simple signal.
Master's practical note
Test the independent power source, not only the lamp on ship's supply. The statutory value is lost if a blackout leaves the equipment unusable.
Equipment boundary and references
Equipment boundary: Carriage and power requirements depend on ship size and SOLAS application. Avoid directing the beam at nearby personnel, aircraft or an unsafe target.
References
- OCIMF SIRE 2.0 Question Library Part 1, Version 1.0, Question 4.1.14
- SOLAS Chapter V regulation 19
- IMO Resolution MSC.95(72)
- International Code of Signals
Last reviewed: 2026-09-11