What is the correct immediate response to a confirmed drift-off (power/thrust loss), and how does it differ from the drive-off response?

A. Alert the platform/structure immediately and assess drift trajectory; attempt to restore power or use emergency generator; anchor is a last resort — the vessel is not being actively driven so there is more time to assess before intervening

B. Immediately go to emergency anchor in all drift-off situations

C. Apply maximum counter-thrust immediately in joystick mode

D. The response is identical to a drive-off — isolate the suspect thruster first in both cases

A. A drive-off occurs when a thruster malfunction or DP system error actively propels the vessel away from position against the operator's intent; a drift-off occurs when power or thrust is lost and the vessel moves passively under environmental forces

B. A drift-off is always slower than a drive-off

C. A drive-off occurs during manual joystick mode; a drift-off only occurs in DP auto mode

D. They are two terms for the same event — the vessel leaves its position in both cases

A. Because drive-offs only occur in bad weather when the vessel is already at risk

B. Because thruster power is being applied in the wrong direction, accelerating the vessel toward (or away from) the structure — the vessel gains speed rapidly and the DPO has very little time to stop it before impact

C. Because a drift-off always results in a controlled shutdown, whereas a drive-off does not

D. Because drift-offs are automatically detected by the DP system and corrected; drive-offs are not