Geographic area = {Mediterranean-Black Sea; China Sea-Japan; Persian Gulf-Bay of Bengal; North Sea, Baltic; N. & S. America, Pacific Coast; Alaska-Bering-USSR Arctic-Iceland; Atlantic Ocean; Gulf of Mexico-W. Indies-Newfoundland}
6
Geographic area ={Pacific Ocean; Atlantic Ocean; Red Sea-W. and E. African Coast}
7
Location = {overseas}
8
Location = {controlled seaways, ports}
9
Gross tonnage ≤ 12603
10
Gross tonnage (12,603-16,705]
11
Gross tonnage > 16,705
12
Geographic area = {Mediterranean-Black Sea; Australia; Alaska-Bering-USSR Arctic-Iceland}
13
Geographic area = {China Sea-Japan; Persian Gulf-Bay of Bengal; North Sea, Baltic; N. & S. America, Pacific Coast; Atlantic Ocean; Gulf of Mexico-W. Indies-Newfoundland; Pacific Ocean; Atlantic Ocean; Red Sea-W. and E. African Coast}