What information must be preserved or recorded immediately after a DP incident to support subsequent investigation?

A. Data can be collected when convenient — it is automatically stored for 30 days

B. Only the position log needs to be saved — the alarm system resets itself safely

C. The DP alarm log (with times and alarm categories), position log (vessel movement record), thruster demand logs, reference system data, any DP computer event logs, and a contemporaneous DPO account of what was observed — all must be preserved before any restart, reset, or maintenance action that might overwrite them

D. Data preservation is the Chief Engineer's responsibility, not the DPO's

A. Any unintended, uncontrolled vessel movement (excursion) or loss of position, thruster runaway (drive-off), loss of redundancy that constituted a genuine risk to the operation, or any DP-related event that could have resulted in a collision, grounding, or loss of life — regardless of whether actual contact or damage occurred

B. Only incidents where the vessel moved more than 50 metres from its setpoint

C. Reporting is voluntary — the vessel operator decides whether to submit a report

D. Only incidents where a structure was struck or a person was injured

A. Any movement of a DP vessel, including planned transits

B. A report submitted by the client after a DP vessel leaves their location

C. A standardised category of DP incident in which the vessel experienced an unintended and uncontrolled excursion from its position setpoint, or a loss of position — the defining characteristic is that the excursion was uncontrolled (not intentional or commanded by the DPO)

D. A category of vessel that exclusively carries out DP operations