The OAV specific inputs [1–6] are listed in Table 5. The OAV is
envisaged to have a motion compensating system for the technician
transfer and a crane to transfer the mid-size components from OAV's
deck to turbine's lower platform. Due to high capital investment
requirement, it is assumed that the offshore wind farm operators
charter an OAV for the period defined as the input [1]. A mobilisation
fee is often included for specialised vessels to compensate the vessel
owner for the time and expense to get the vessel on site and ready for
work. The vessel owner then charges by the day as the vessel is
operated. Likewise, the input [2] has to be defined in order to address
the period between the vessel is chartered and it arrives at the
offshore wind farm location. The inputs [3–6] display the generic
characteristics of the OAV. It is assumed that OAV and CTV working
shifts start at the same time.