What is the DP close proximity zone around a wind turbine generator (WTG) and what are its implications for ASOG setting?

A. The WTG close proximity zone defines where reference systems are most accurate and has no safety implication

B. The close proximity zone is a health and safety exclusion zone for personnel on the turbine, not relevant to DP

C. Only very large WTGs (over 8MW) have a defined close proximity zone

D. The close proximity zone is the defined exclusion envelope around the WTG structure — typically a radius within which no vessel should approach without specific DP close-proximity procedures active; ASOG limits for W2W operations are set inside this zone and are necessarily tighter than standard offshore ASOG limits to account for the reduced collision margin

A. W2W is a helicopter transfer method for offshore wind installations

B. W2W refers to transferring crew between two vessels at sea using a gangway

C. W2W is a type of anchor mooring system used near offshore wind farms

D. W2W is the transfer of technicians from a service vessel directly onto a wind turbine generator (WTG) via a motion-compensated gangway, with the vessel holding in DP alongside the WTG transition piece — the challenge is that the vessel must hold extremely close (typically 2–5m) to a fixed structure for extended periods, with technicians physically connecting the vessel and WTG via the gangway

A. DP1 is sufficient since the turbines are fixed and the vessel only needs to maintain a general heading

B. DP3 is the minimum and DP2 is not accepted by any offshore wind operators

C. No minimum DP class applies to W2W operations — it is decided vessel by vessel

D. DP2 is the standard minimum for W2W operations — the consequence of a single failure causing a loss of position while technicians are on the gangway could be fatal (gangway shear, crush, or capsize); the redundancy of DP2 ensures a single equipment failure cannot result in loss of position