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.
Who decided the rules for avoiding collisions in international waters?
The International Regulations for Preventing Collisions at Sea 1972 (COLREGs) are published by the International Maritime Organization.

Question: What's the history of these regulations?
Self-contained rewrite: What's the history of the regulations for preventing collisions at sea?