1. Support vessel reference Identification and location of support vessel, NVES input lines IVES IDWFTR XG YG ZG DIRX IVES: integer, default: 1: Vessel number, 1 <= IVES <= NVES. IDWFTR: character(6), default: 'NONE': Identifier for support vessel motion transfer function IDWFTR = 'NONE' means no transfer function specified XG: real: X position of vessel coordinate system referred in global system \([\mathrm {L}]\) YG: real: Y position of vessel coordinate system referred in global system \([\mathrm {L}]\) ZG: real: Z position of vessel coordinate system referred in global system \([\mathrm {L}]\) Confer Data Group E: Support Vessel Data DIRX: real: Direction of vessel X-axis. See Location of support vessel coordinate system. Boundary conditions Global springs