Abstract: A fin in one embodiment includes a fin box assembly including a fin box adapted for coupling to a body portion of a water-borne device, and a fin assembly having a base member that is releasably engagable in said fin box. A fin assembly according to one embodiment includes a base member adapted for releasable engagement in a fin box that is coupled to a water-borne device, and a fin member coupled to said base member. A water-borne device in one embodiment includes a body portion, and a fin box assembly coupled to the body portion, the fin box assembly including a fin box adapted for receiving a fin assembly having a base member that is releasably engagable in said fin box.