142. A seaplane and a motorboat are on crossing courses. If the motorboat is to the left of the seaplane, which has the right-of-way?

According to navigation rules applicable to seaplanes and motorboats, when two vessels are on crossing courses, the vessel to the right (starboard) has the right-of-way. In this scenario, if the motorboat is to the left of the seaplane, the seaplane has the right-of-way and should maintain its course and speed, while the motorboat must give way.