Conversation so far:
who has the right of way in international waters
In international waters, no vessel ever has absolute right of way over other vessels.
How do vessels avoid collisions in international waters?
For example, two power-driven vessels approaching head-to-head, are both deemed to be give way and both are required to alter course so as to avoid colliding.

Question: Who decided the rules
Self-contained rewrite: Who decided the rules for avoiding collisions in international waters?