Abstract: A boat stabilizing system for use with a boat having vertically-oriented tubular sockets adjacent the gunwales thereof. Vertically-oriented upright members in contact with the bottom extend upwardly through the water adjacent the tubular sockets. A clamping member is associated with each upright member and includes a tubular sleeve that slidingly overfits the upright member. Each tubular sleeve includes a screw clamp for securing the tubular sleeve to the upright. An arm secured to the tubular sleeve is sized to overlie the gunwale of the boat and includes a downwardly-extending pin member that is sized to be receivable in the tubular socket.