What does "combined footprint" mean for a W2W vessel operating alongside a WTG, and how does it affect the safe operating limit?

A. The combined footprint is the total area of seabed/surface exclusion zone occupied by both the vessel's DP position-keeping envelope AND the WTG's structural exclusion zone — the safe operating limit must ensure that no part of the vessel's expected position range can bring the hull into contact with the WTG structure, considering both the vessel's DP tolerance and the turbine's own positional accuracy

B. Combined footprint refers to the vessel's deck plan and the gangway landing area together

C. The combined footprint is the total fuel consumption of the vessel and turbine during a shared operation

D. The combined footprint is only relevant for vessels anchored near WTGs, not DP vessels

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