A frame system suitable for use on a boat and capable of supporting one or more tarpaulins to protect the boat from the elements, comprising one or more sets of couplers and hinged angle elements adapted to be used with off-the-shelf connecting members, such as PVC pipes, such that when assembled the frame system provides a canopy frame arching over the top side of the boat, with the lateral sides of the frame system sloping upward and meeting over the longitudinal midline of the boat.