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Glossary term Description
Nautilus International

Anglo-Dutch seafarers’ union

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 

nm

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

NOAA

(US) National Oceanic & Atmospheric Administration

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.

NOx

oxides of nitrogen

nt

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

NTSB

National Transportation Safety Board (US)