Responsibilities between vessels

Priority can sound as though one vessel is relieved of considering the encounter. Rule 17 is more precise. It begins with one vessel required to keep out of the way and the other keeping course and speed, then describes when the latter may and must act. These stages have no universal fixed distances. The drawing sequences legal conditions rather than a clock, mile scale or helm command. Observed development determines which conditions are present, so an initial role cannot be treated as a permanent right to proceed regardless of danger.

Rule 16 requires, so far as possible, early and substantial action to keep well clear. Rule 8 accompanies it: apparent action in time, without creating another close-quarters situation, and effectiveness checked until past and clear. The role is not fulfilled merely by starting a minimal alteration. Nor does the duty depend on the other vessel calling, sounding doubt or showing inconvenience. Continuing appraisal under Rules 5–7 supplies the context. The other vessel’s obligations coexist rather than reducing the give-way vessel’s own duty.