Motion compensating carrier assembly configured to be supported on a hull of a feeder vessel, said carrier assembly having: - one motion compensated platform, which is configured for receiving and retaining thereon an elongate object, e.g. an elongate wind turbine object, the platform comprising a top surface, - a motion compensation mechanism configured for connecting the one motion compensated platform to the hull and configured to provide compensating movements of the platform with respect to the hull, e.g. such as to maintain at least one stationary position of the platform in space, e.g. in which stationary position the platform is horizontal, said motion compensation mechanism comprising: - multiple extendable carrier actuators (32, 33, 34), each configured to extend and shorten along a respective longitudinal axis (32lg, 33lg, 34lg) thereof, each connectable at a respective first longitudinal end thereof via a respective first pivotal coupling to the hull and at a respective second longitudinal end via a second pivotal coupling to the platform, characterized in that the motion compensation mechanism further comprises: - one or more carrier winches, each carrier winch configured for driving a carrier cable of which a cable segment extends from the respective carrier winch to the platform, such that traction by the respective carrier winch counteracts an extension of at least one of the carrier actuators, wherein the multiple extendable carrier actuators are embodied as passive motion compensators to provide passive compensating movements of the platform, and wherein the one or more carrier winches are embodied as active motion compensation winches to provide active compensating movements of the platform. - one motion compensated platform, which is configured for receiving and retaining thereon an elongate object, e.g. an elongate wind turbine object, the platform comprising a top surface, - a motion compensation mechanism configured for connecting the one motion compensated platform to the hull and configured to provide compensating movements of the platform with respect to the hull, e.g. such as to maintain at least one stationary position of the platform in space, e.g. in which stationary position the platform is horizontal, said motion compensation mechanism comprising: - multiple extendable carrier actuators (32, 33, 34), each configured to extend and shorten along a respective longitudinal axis (32lg, 33lg, 34lg) thereof, each connectable at a respective first longitudinal end thereof via a respective first pivotal coupling to the hull and at a respective second longitudinal end via a second pivotal coupling to the platform, - multiple extendable carrier actuators (32, 33, 34), each configured to extend and shorten along a respective longitudinal axis (32lg, 33lg, 34lg) thereof, each connectable at a respective first longitudinal end thereof via a respective first pivotal coupling to the hull and at a respective second longitudinal end via a second pivotal coupling to the platform, characterized in that the motion compensation mechanism further comprises: - one or more carrier winches, each carrier winch configured for driving a carrier cable of which a cable segment extends from the respective carrier winch to the platform, such that traction by the respective carrier winch counteracts an extension of at least one of the carrier actuators, - one or more carrier winches, each carrier winch configured for driving a carrier cable of which a cable segment extends from the respective carrier winch to the platform, such that traction by the respective carrier winch counteracts an extension of at least one of the carrier actuators, wherein the multiple extendable carrier actuators are embodied as passive motion compensators to provide passive compensating movements of the platform, and wherein the one or more carrier winches are embodied as active motion compensation winches to provide active compensating movements of the platform.