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.

Comment
In LOAC-governed situations under the “other rules of international law” clauses in UNCLOS, a different definition may apply. The same may be the situation if the UN Charter supersedes UNCLOS or if jus cogens norms apply.
Former ECDIS Glossary, page 1, defined “accuracy” as “[t]he extent to which a measured or enumerated value agrees with the assumed or accepted value.” The current ECDIS Glossary does not define “accuracy.”