The issue of abandoned vessels is partially addressed in the Navigation Protection Act. The Navigation Protection Act does not provide the full set of tools to deal with abandoned vessels. To a large extent, abandoned vessels are the responsibility of the vessel owners to deal with.
Through the Navigation Protection Act, there are some provisions to deal with obstructions to navigation. In the event that abandoned vessels are obstructions to navigation, there are provisions that would allow for those vessels to be managed. There's also a provision in section 20 of the act that allows for abandoned vessels to be addressed, provided there's a third party who would like to take ownership of that vessel.
There are some provisions within the NPA, but there are also broader considerations and the responsibility of the vessel owners that need to taken into account.