Question 1

A DP2 offshore support vessel is arriving at a busy installation field. The deck team is eager to start work and the installation manager advises there is a weather window closing. The lead DPO has been asked to expedite the pre-DP setup.

Which pre-operation step is the one that cannot be shortened or skipped under any schedule pressure?

Accepted Answer

Verifying that all reference systems are operational, checking gyro agreement, confirming ASOG criteria with the client, and completing the consequence analysis test before placing the vessel in a risk-elevated position — these steps confirm the vessel is actually capable of the operation it is about to perform Schedule pressure is cited in IMCA incident reports as the leading contextual factor in inadequate pre-DP setup. The steps that cannot be skipped are the ones that confirm DP capability actually exists for this operation right now: reference systems healthy and cross-checked, gyros agreeing, ASOG reviewed and agreed, consequence analysis test passed. These steps cannot be completed retrospectively — if a fault is discovered after the vessel is already in position with divers in the water, the consequences of discovery are far greater than the consequences of a delayed start. The DPO's professional duty is to complete these checks, not to skip them under commercial pressure.

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.