Three minutes later, DGNSS 2 also drops out. The vessel now has zero valid position references while in DP Auto mode. What happens to the DP system, and what must the DPO do?

A. No action is needed since the thrusters will continue running on their last commanded settings safely

B. The vessel should immediately deploy the anchor as the first response, regardless of water depth or anchoring capability

C. The DP system will automatically maintain perfect position indefinitely using inertial data with no DPO action required

D. The DP system can no longer compute a valid position solution and will typically flag a major alarm and may revert to dead-reckoning or freeze the last known position internally for a short period; the DPO must take immediate manual control (joystick or manual thruster control) since DP Auto can no longer be trusted to hold position correctly

A. Immediately switch to manual joystick control regardless of the remaining references' status

B. Ignore the dropout since two references remain — no action is required

C. Restart the DGNSS 1 receiver immediately without checking the current position solution first

D. Confirm the DP system has automatically excluded DGNSS 1 from the position solution and is now running on the two remaining references (DGNSS 2 and Fanbeam); verify the resulting position solution is stable before doing anything else

A. Increase monitoring vigilance specifically — with only two references, there is no longer a "voting" majority if one of the remaining two starts to disagree, so any divergence between DGNSS 2 and Fanbeam now requires immediate judgement rather than automatic resolution; the DPO should also consider what reference would be left if either of these also fails

B. Nothing changes — two references is operationally identical to three for monitoring purposes

C. Immediately suspend operations regardless of how the two remaining references agree

D. Disable the alarm system since fewer references means fewer expected alarms