what is the meaning of “Accuracy” in law of the sea, LOSC and customary international law

In UNCLOS analysis, “accuracy” means the extent to which a measured or enumerated value, such as “mile” or “nautical mile,” agrees with an assumed or accepted value.
what is the meaning of “Accuracy” in law of the sea, LOSC and customary international law, “Accuracy” in law of the sea, 200 nautical miles, Why do ships use nautical miles instead of kilometres or statute miles?

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