In an overtaking situation, the vessel being overtaken has the right of way and must hold course and speed. The overtaken vessel is the stand-on vessel. In a narrow channel, sailing vessels have no right to hamper deep draft vessels that can only navigate in channel. Sailboats have the right of way over motorboats unless they are the overtaking vessels. Canoes and rowboats have the right of way over sailboats.
Any vessel operating under both sail and power is classified as a motorboat.
The International Rules are applicable outside established lines of demarcation, and the Inland rules apply inside these lines. The boat operator is responsible for knowing and following the applicable navigational rules. Stay between the red and green buoys and keep to the right of the channel. Returning means going upstream, or coming from the ocean. It's a matter of both courtesy and common sense not to anchor in channels.