Freedom of Navigation: Free Passage on the Seas

The principle of free passage on the seas and the military operations that enforce it.

Navigational Freedoms Under UNCLOS

Freedom of navigation is a foundational principle of the law of the sea. UNCLOS protects the right of ships to transit through territorial seas (innocent passage), international straits (transit passage), and archipelagic waters (archipelagic sea lanes passage). On the high seas and in EEZs, all states enjoy freedom of navigation.

The US Freedom of Navigation (FON) program, established in 1979, sends naval vessels to challenge what it considers excessive maritime claims by any state — allies and adversaries alike. Since 2015, FON operations (FONOPs) in the South China Sea have become the most visible and contentious, with US warships sailing within 12 nm of Chinese-built artificial islands.

Strategic Chokepoints

Freedom of navigation is not abstract — it is existential for global trade. Over 80% of world trade by volume travels by sea, passing through a handful of critical chokepoints: the Strait of Malacca (25% of global trade), the Strait of Hormuz (20% of oil), the Suez Canal, the Bab el-Mandeb, and the Panama Canal.

Any disruption to these passages has immediate global economic consequences. The 2023-2024 Houthi attacks on Red Sea shipping forced rerouting around Africa, adding weeks and millions of dollars to each voyage. This demonstrated how vulnerable the global economy remains to maritime disruption.

Transit Passage vs Innocent Passage

Transit passage through international straits is broader than innocent passage through territorial seas. Ships and aircraft may transit straits in their 'normal mode' — meaning submarines can stay submerged and military aircraft can overfly. This is because many international straits (like Hormuz and Malacca) fall within territorial waters, and requiring innocent passage rules would give coastal states a chokehold on global trade.

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Treating concepts as definitions to memorize rather than analytical tools to apply.
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Continuing Your Study

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