U.S. does not need to ratify UNCLOS to preserve freedom of navigation rights
It is not essential or even necessary for the United States to accede to UNCLOS to benefit from the certainty and stability provided by its navigational provisions. Those provisions either codify customary international law that existed well before the convention was adopted in 1982 or “refine and elaborate” navigational rights that are now almost universally accepted as binding international law.
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Quicktabs: Arguments
The U.S. enjoys navigation rights by customary international practice. The fact that the U.S. is not a convention member does not mean that other states will begin to demand notification by U.S. ships entering their waters or airspace. Indeed, the U.S. is not a signatory to the convention today and yet has freedom of the seas because current participants are required to grant the U.S. navigation rights afforded by customary international practice. In addition, these states have reciprocal interests in navigation rights that will discourage them from making such demands on American ships in the future.