A marine hub attaches to a boat pedestal, dock support or other vertical support post, and has removable interchangeable attachment arms that radiate from a main body tube or disk that fits around the support post. The main body tube has a bore with an inside diameter just larger than the diameter of the support post. An adapter ring may be used within the bore of the main body tube for mounting on posts that are smaller, or not cylindrical. Support stub members radiate from the main body tube, and the attachment arms secure to these with quick release pins. The support arms may be used with fishing or boating accessories, beverage holders, or other equipment.
