An assembly for safely supporting an occupant in a vehicle such as, but not limited to, a watercraft and including a seat assembly and a support frame. A connector assembly is disposed and structured to movably interconnect the seat assembly to said support frame along a first rotational axis. A mount assembly is connected to the vehicle and includes an attachment assembly disposed and structured to movably interconnect the support frame to the mount assembly along a second rotational axis. The support frame and the connector assembly associated therewith as well as the mount assembly and the attachment assembly associated therewith are cooperatively disposed and structured to orient said first and second rotational axes in substantially perpendicular relation to one another, such that the seat assembly will be able to move in a substantially gimbal-like fashion relative to the movement of the vehicle while traveling.