A (22) | B (29) | C (39) | D (16) | E (14) | F (27) | G (10) | H (16) | I (18) | J (1) | K (6) | L (26) | M (18) | N (8) | O (5) | P (24) | R (10) | S (45) | T (14) | U (11) | V (9) | W (6)
Glossary term Description

National Transportation Safety Board (US)


net tonnage. The residual tonnage after the allowances for engine room, crew spaces and bridge have been deducted from the gross tonnage


oxides of nitrogen

Northern Sea Route

A shipping lane officially defined by Russian legislation from the Kara Sea to the Pacific Ocean specifically running along the Russian Arctic coast from Kara Gates Strait between the Barents Sea and the Kara Sea, along Siberia, to the Bering Strait. The entire route lies in Arctic waters and within Russia's Exclusive Economic Zone (EEZ). Parts are free of ice for only two months per year.


(US) National Oceanic & Atmospheric Administration


nautical miles. Historically, a nautical mile represented the distance spanned by one minute of arc of the Earth (north-south). Now formalised as 1,852 metres

New Panamax

New Panamax is becoming the accepted term for post-2015 Panamax vessels, and in terms of container ships, the expanded canal will be able to handle vessels up to 366 m long, displacing 170,000 tonnes and carrying about 12,000–12,500 teu depending on ship design (currently the canal can only handle vessels up to about 5,500 teu). The canal’s new lock dimensions, which will dictate the size of ships allowed to pass through, are:

Length – 427 m 

Width – 55 m 

Depth – 18.3 m 

Nautilus International

Anglo-Dutch seafarers’ union