Question 1

A DP2 semi-submersible accommodation vessel is holding position during a critical offshore maintenance window. Weather has reached the ASOG yellow level. The installation manager calls the bridge and says: "We need four more hours — we're nearly done. Can you hold on a bit longer?" The master turns to the lead DPO.

What is the correct response to this request?

Accepted Answer

The ASOG must be followed — the yellow alert requires the master to be informed, close monitoring, and readiness to abort. Extending beyond yellow without an improving forecast normalises ASOG violations. The master should explain the ASOG position clearly to the installation manager, not yield to schedule pressure IMCA incident data consistently shows schedule pressure as a key factor in ASOG violations that precede DP incidents. The yellow alert is not a decoration — it is a defined decision point requiring specific management actions, not a request to the client to "hang on." The master's legal and SMS obligation is to the ASOG. If conditions worsen to red, operations must abort. The correct response to "can you hold on" is a professional explanation of the vessel's current ASOG status and what the criteria require — not a commercial accommodation that places crew, vessel, and environment at risk.

Question 2

A trainee DPO asks why the vessel has an Activity Specific Operations Guideline (ASOG) for each job, given that the vessel already has a general DP Operations Manual.

What is the primary purpose of an ASOG, and who is responsible for setting its limits?

Accepted Answer

The ASOG translates general vessel DP capability into specific, agreed criteria for a particular operation and worksite — weather limits, reference system minimums, thruster requirements, and alert zones. It is developed jointly by the vessel operator and the client/installation authority for each specific operation The ASOG (Activity Specific Operations Guideline) is the critical bridge between the vessel's certified DP capability and the specific risks of a particular operation. General capability is not enough — a vessel might be able to hold position in 35 knots open sea, but the same vessel near a fixed structure with a riser connected may need to abort at 20 knots to prevent structural damage. The ASOG sets specific go/no-go limits for that job, agreed between the vessel operator and the client, and defines what combination of failures requires an immediate disconnect or abort. It must be site-specific and operation-specific.

Question 3

During a sensitive DP operation, the lead DPO briefs the incoming watch DPO: "We're currently Green. If we go Yellow, I want to know immediately." A junior watch officer overhears and asks what the Green/Yellow/Red system actually means.

Which statement best describes the ASOG traffic light alert system?

Accepted Answer

Green means operations can continue normally within all ASOG limits; Yellow means a limiting parameter has been reached or a degradation has occurred and the DPO must assess whether to continue — typically with master informed; Red means the abort criteria have been met and operations must stop or disconnect immediately The ASOG traffic light system gives DPOs an immediately understandable status framework. Green = operate normally within all defined limits. Yellow = a defined threshold has been crossed (weather approaching limit, reference system degraded, thruster fault) — the master must be informed, monitoring intensifies, and the DPO must be ready to abort. Red = abort criteria met — operations stop, disconnect sequence initiated. The criteria for each colour are defined in the operation-specific ASOG, not by generic rules. The handover briefing must always include current ASOG status.