Practise distress in A1, A2 and the ship-specific A3/A4, loss of a primary medium, medical urgency/distress, false-alert cancellation, abandonment and receipt of route-relevant MSI. Use isolated simulation or the approved equipment test mode. Never deliberately transmit a real distress alert for practice.
Check priority, available communication path, identity and position/time, voice or satellite follow-up, listening and coordination, backup equipment and records. If a real false alert escapes a drill, stop the exercise and cancel it immediately. Debrief errors and repeat safely. These are study exercises, not universal official GOC pass marks, examination time limits or accreditation; the examining administration sets its own approved assessment.
Make the drill a controlled decision
An integrated GMDSS drill is a study exercise that connects priority, available medium, identity, position, time, follow-up, backup equipment, and records. It is not a miniature licence examination and it is not permission to radiate a real distress alert. Begin with a fictional vessel, fictional identities, an explicit sea-area and service assumption, and a non-radiating simulator or approved equipment test mode.
One scenario, several checks
A good scenario changes one condition at a time: a primary medium is unavailable, the position is stale, a person needs medical help, or an accidental alert appears. The learner must explain why the next choice follows from the facts. A1, A2, A3, and A4 are service and carriage contexts, not four universal button routes. A3 in particular depends on the recognized satellite service and ship earth station carried.
Use this numbered workflow:
- 1State the simulated vessel, voyage context, medium, and source version.
- 2Classify the situation as distress, urgency, safety, or routine.
- 3Confirm the fictional identity and the best available position/time.
- 4Choose the available communication path without inventing coverage.
- 5Plan the voice or satellite follow-up and listening response.
- 6Check backup equipment and write the fictional record.
- 7Debrief one observed fact, one equipment-dependent issue, and one administration-dependent issue.
| Drill result | What it demonstrates | What it does not demonstrate |
|---|---|---|
| Correct classification | Reasoning from the stated facts | Real-world readiness in every vessel |
| Correct simulated path | Understanding of the exercise setup | Current service coverage |
| Complete sample log | Traceable learning record | An official ship log or SAR receipt |
| Safe cancellation branch | Awareness of false-alert risk | Authority acceptance of a real event |
False alert and abandonment branches
MSC.514(105) is IMO guidance for avoiding false distress alerts. Use it as a safety boundary for the drill, not as a universal exam standard. A simulated abandonment branch can ask which equipment the muster plan assigns to the survival craft and how the learner would record the check. It must not teach a universal device-control sequence. An MSI branch should identify only route-relevant, current information and the service that supplies it.
Assessment boundary
The site can assess whether a learner classified the fictional situation, preserved identity and position/time, chose the stated simulated path, and recorded the reasoning. It cannot award a universal GOC pass mark, examination time limit, accreditation, or certificate outcome. Those belong to the competent administration and approved training or examination process.
Sources: IMO MSC.514(105) index; IMO GMDSS circulars; IMO SAR documents and current DSC procedure listing.
Official references · 2026-09-09
Apply what you learned
A fictional vessel loses its primary simulated medium during a medical-distress scenario. The console provides a stale position and a non-radiating test mode.
What must you explain before advancing?
Suggested answer: The priority, best available position/time, alternate simulated path, follow-up, backup check, and record.
Why this works: The drill tests a chain of decisions. The stale position is reported with its time, the alternate path is limited by the stated scenario, and every action remains inside test mode. No result implies certification or real coverage.
Continue with guided radio exercises.
Practise in the radio simulatorKey Takeaways
An integrated drill must state its fictional vessel, service assumptions, source version, and non-radiating mode.
Reason from priority, identity, position/time, available path, follow-up, backup, and record in that order.
MSC.514(105) supplies false-alert avoidance guidance; it does not define universal examination outcomes.
A simulator result demonstrates bounded learning evidence, not ship compliance, SAR success, or certification.
Common Mistakes
Treating A1–A4 as fixed equipment button routes or assuming coverage without a service check.
Practising with a live distress or relay transmission.
Reporting a correct worksheet as proof of an official GOC pass, vessel compliance, or real SAR result.
Test Your Knowledge
Practise this topic and review the explanation for each answer.
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