Most sail boats, such as Elizabeth Jean, have at least three holes on the boat deck. They are usually clearly labeled: diesel, water, and waste. Notwithstanding these labels it is fairly easy to misuse them. Since we departed Seattle, in fact, we are aware of the following mishaps: putting water in the waste tank, putting water in the diesel tank and putting diesel in the waste tank. The first of these mistakes will flush your holding tank into what ever water body you are in. Not a great idea. The second will mess up your diesel and your engine if you don’t empty the tank in a safe disposal tank and start again. Be careful not to wipe out the tank with something that leaves fibers as this can also be bad for the engine. Regarding the third mistake–it may be stating the obvious, but human waste and diesel are not a good combination. Having witnessed the consequences of these three misuses of the three boat holes we try to read our tank caps very carefully, especially when tired or in a distracting situation.