X Axis Y Axis Z Axis The wire passes through a Gimball head which is free to move in X and Y axis up to the mechanical limitations of the assembly.The angle the head is at relative to the vertical for the X axis and horizontal I for the Y axi is measured by potentiometers and sent to the DP computer.The wire length is measured counter an sent to the compute n electric motor coupled to the wire drur n via an electric ch.The field current on the clutch determines the dearee of coupling and therehe rn achie degree of torque note that this torque if far to small to lift the weight and a seperate hydraulic motor is provided). sel moves the angle betwe n the head and weig as well as the wire ion to the we accelerometers and factored in. dadD wards the wei ht when the el is 'walked say moving into A mo vessel. The size of the weight(and corresponding wire diameter)is determined by the depth that the vessel operates and the operating conditions the vessel works in.TypicallyThe wire passes through a Gimball head which is free to move in X and Y axis up to the mechanical limitations of the assembly. The angle the head is at relative to the vertical for the X axis and horizontal for the Y axis is measured by potentiometers and sent to the DP computer. The wire length is measured by a line out counter and sent to the DP computer. With the weight on the bottom contant tension is placed on the wire keeping it taut, this is achieved by having a constant rpm electric motor coupled to the wire drum via an electric clutch. The field current on the clutch determines the degree of coupling and thereby the degree of torque ( note that this torque if far to small to lift the weight and a seperate hydraulic motor is provided). As the vessel moves the angle between the head and weight as well as the wire length will alter. A calculation is made by the DP computer which gives the vessels relative position to the weight. Vessel movement through wave action is measured by the accelerometers and factored in. Shown is a system which is deployed from the ships side, a limitation is placed on the vessels movement towards the weight when the vessel is 'walked' ( say moving into position or following an ROV). A second system would be mounted on the opposite side. Alternately a single system may be fitted operateing through a moonpool in the centre of the vessel. The size of the weight ( and corresponding wire diameter) is determined by the depth that the vessel operates and the operating conditions the vessel works in. Typically 2