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The National Seas Act 1977 states that delimitation of boundaries in relation to neighboring states, the offshore seas of the State extend to a distance of 200 miles seaward from the baselines and, unless otherwise specified, shall be deemed to comprise all the waters outside the baselines and within a line proclaimed for the purposes of this section by the Head of State, acting on advice, in the National Gazette.

PNG Contiguous zone was calculated from its territorial sea baseline using a special delimitation software called MarZone.