What type of marine sanitation device provides no treatment of waste?

The choice of a Type III Marine Sanitation Device (MSD) is correct because it is designed specifically for holding and storing sewage and does not offer any treatment for the waste. This type of device is typically a holding tank that retains human waste until it can be properly discharged into a shore-side facility, which is essential for preventing pollution in navigable waters.

Type I MSDs are designed to treat wastewater and can discharge treated effluent into the water, while Type II MSDs treat waste more effectively than Type I devices, allowing for a cleaner discharge. On the other hand, Type IV MSDs are often referred to as "portable" or "holding" tanks, but they usually imply that they can be transported when full, yet they still serve the same purpose of waste holding as Type III devices. Thus, Type III MSDs are distinctly recognized as devices that do not treat waste, aligning perfectly with the question's requirement.