What tool is used to cut manila stops during towing?

The tool that is specifically designed for cutting manila stops during towing is a hand hatchet. This type of tool is suitable for the job because it has a sharp blade and a robust handle that allows for effective chopping and cutting of rope materials, like manila, which is typically used for rigging and towing applications. The weight and design of a hand hatchet enable a user to apply significant force, making it easier to cut through thick or resilient materials quickly and efficiently.

In comparison, the other tools listed, while they may have cutting capabilities, are not as effective for this particular task. A cutter shear is normally used for cutting wire or metal, which does not apply here. A utility knife may lack the strength and blade design needed for heavy-duty cutting, and a saw blade is not practical for cutting rope, as it is more suited for wood or other solid materials. Thus, the hand hatchet stands out as the most appropriate and effective choice for cutting manila stops during towing operations.