Another sewage disposal option is a mobile cart equipped with a sewage pump, hose, and holding tank. When a pumpout is needed, the cart is wheeled to the boat for service. After the boat is pumped out, the cart, now loaded with sewage, is wheeled to a hydrant (usually located landside) and the pump is used to discharge the sewage for proper disposal.
Like all the systems this one also requires access to connect to the municipal sewer or a landside holding tank to be emptied and disposed of properly by a contractor. Disadvantages of this system include the extra time needed to pump waste, since you are pumping it twice, once from the boat to the cart, then to empty the cart for proper disposal. Additionally, when full the cart can be heavy and difficult to push; some facilities choose to put this equipment on a motorized vehicle like a golfcart to move it more easily, however that will likely limit the docks in which a pumpout can be conducted from. Advantages of this system include no need for extensive plumbing and the ability to store it in a safe area when not in use, reducing wear and tear due to exposure to the elements and storm damage.