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- nadir
- point in the celestial sphere diametrically opposite zenith
- nautical mile
- a nautical mile is equal to one minute or one sixtieth of a degree of latitude; value varies from 6 046 feet on the equator to 6 108 at the poles; for practical purposes a standard of 6 080 feet or 1 853 metres is used; also known as sea mile
- naval architecture
- the art and science of designing and constructing vessels
- navel pipe
- steel pipe through which cable passes and leads down to the chain locker; also known as spurling pipe
- navtex
- a radio communication system for broadcasting navigational information to ships; the receiver on board the ships automatically print out the information without human intervention
- negative slip
- the actual distance travelled by a ship is greater than the theoretical distance calculated by the number of revolutions and pitch of the propeller
- Net Register Tonnage
- refers to Gross Tonnage less spaces which are not allowed for the carriage of cargo or passengers; also known as Net Tonnage or NRT for short; sometimes written as Nett Tonnage
- neutral axis
- an imaginary plane within a beam or other structural member under stress that is not subjected to tension and compression
- neutral stability
- describes the state of flotation of a ship which will remain in the deflected position if moved i.e. it will not have a righting or capsizing moment
- New Jason Clause
- protective clause mainly for the shipowners entitling them to recover in general average even when the loss is caused by negligent navigation
- Nippon Kaiji Kyokai
- the Japanese Classification Society or NK for short
- normalising
- a heat treatment process similar to annealing except that the metal cools more quickly to increase the strength toughness and hardness; the metal is allowed to cool in still air rather than in the furnace
- notice of readiness
- a notice presented to shipper or his agent by masters or ships agent stating the readiness of the arrived ship to load; it determines when the time starts to count; NOR for short
- notice to mariners
- weekly notices concerning changes in navigation matters that are used by mariners to keep their charts updated regularly; NTM for short
- NVOCC
- stands for Non-Vessel-Operating Common Carrier; it is defined in the United States Shipping Act 1984 as a "...common carrier that does not operate the vessels by which the ocean transportation is provided and is a shipper in its relationship with an ocean common carrier."
