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naphtha A petroleum distillate that was used in early internal combustion engines.
Narrow boat: A boat with a beam of up to seven-foot, originally working boats on the midlands canals.
Narrow Channel Rule: Rule of Collision Regulations. Requires a vessel navigating a narrow channel to keep to that side of mid-channel that is on her starboard hand.
Narrows Small passages
NATIONAL ARGO BUREAU A private organization having representatives throughout the main harbors in the U.S. It is empowered to inspect cargoes of a hazardous nature and issue certificates which are automatically approved by the Coast Guard.
NATIONAL CARGO BUREAU A private organization having representatives throughout the main harbors in the U.S. It is empowered to inspect cargoes of a hazardous nature and issue certificates which are automatically approved by the Coast Guard.
NATIONAL FLAG The flag carried by a ship to show her nationality.
NATIONAL FLAG The flag carried by a ship to show her nationality.
nautical Having to do with boats, ships or sailing.
Nautical almanac An annual book containing astronomical and tidal information
NAUTICAL MILE One minute of latitude; approximately 6076 feet - about 1/8 longer than the statute mile of 5280 feet.
Nautical mile One 60th of a degree of latitude (a minute); slightly longer than a standard mile.
nautical mile Distance at sea is measured in nautical miles, which are about 6,067.12 feet, 1.15 statute miles or exactly 1,852 meters. Nautical miles have the unique property that 1 minute of latitude is equal to 1 nautical mile. (There is a slight error, because the earth is not perfectly round.) Measurement of speed is done in knots, where 1 knot equals 1 nautical mile per hour. A statute mile is used to measure distances on land in the United States and is 5,280 feet.
NAVAREA One of 16 areas into which the world's oceans are divided by the International Maritime Organization for dissemination of navigation and meteorological warnings
Navies: The shorten version for Navigators.
NAVIGATION The art and science of conducting a boat safely from one point to another.
Navigation Buoys: Buoys that are used to mark the edge of a channel/s.
Navigation lights Lights on a boat help others determine its course, position and what it is doing. Boats underway should have a red light visible from its port bow, a green light on the starboard bow and a white light at its stern. Other lights are required for vessels under power, fishing, towing, etc.
NAVIGATION RULES The regulations governing the movement of vessels in relation to each other, generally called steering and sailing rules.
Navigator The person responsible for navigating a boat.
Navigators: The term given to the laborers who built the navigation's.
NAVTEX Telegraphy system for transmission of maritime safety information, navigation and meteorological warnings, and urgent information to ships
NBDP narrow-band direct printing Automated telegraphy, as used by the NAVTEX system and telex-over-radio
NCOB no cargo on board
NDT non-destructive testing
NECSA  Navigational Electronic Chart System Association
Neep tides Tides with smaller range than spring tides two days after the fist and last quarters of the moon
Negligence Imprudent action or omission which may cause injury, damage or loss.
NEOBULK Shipments consisting entirely of units of a single commodity, such as cars, lumber, or scrap metal.
NET CAPACITY The number of tons of cargo which a vessel can carry when loaded in salt water to her summer freeboard marks. Also called cargo carrying capacity, cargo deadweight, useful deadweight.
Net Manifest A manifest containing all freight details including negotiated disbursements.
net tonnage The volume of cargo a ship could carry, equal to gross tonnage minus the crew cabins, storerooms and machinery spaces. One ton equals 100 cubic feet.
NET TONNAGE Equals gross tonnage minus deductions for space occupied by crew accommodations, machinery, navigation equipment and bunkers. It represents space available for cargo (and passengers). Canal tolls are based on net (registered) tonnage.
Net Weight The weight of the goods, excluding all packing.
Network Planning System A technique for making a time schedule for the implementation of a project.
New Computerised Transit System A concept for custom authorities to manage European Community and common transit, based on the use of computer systems and EDI techniques.
Newel: A bridge term for a center pillar, similar to the post that supports the top or bottom of a staircase handrail.
NFTZ non free trade zone
NI The Nautical Institute
NIHQ Nautical Institute Headquarters, London
Nipped: Said of a vessel when pressed by ice on both sides.
NK (NKK) Nippon Kaiji Kyokai (classification society)
NM nautical mile
NMEA National Marine Electronics Association
NNAUTICAL MILE One minute of latitude; approximately 6076 feet about 1/8 longer than the statute mile of 5280 feet
NNR national nature reserve
No go zone Area into which a boat can not go without tacking
NOAA National Marine and Atmospheric Administration
Nog: Treenail in heel of a shore supporting a ship on the slip.
Non Vessel Operating Common Carrier A party who undertakes to carry goods and issues in his own name a Bill of Lading for such carriage, without having the availability of any own means of transport.
NON-CONFERENCE LINE A shipping line which operates on a route served by a liner conference but which is not a member of that conference.
NONCONTIGUOUS Domestic shipping routes serving Alaska and non-continental U.S. States and territories.
NOR notice of readiness
Normal Charge The specified general cargo rate without any quantity discount (air cargo).
Normal General Cargo Rate The under 45 kgs rate or, if no under 45 kgs rate exists, the under 100 kgs rate (air cargo).
NORSKE VERITAS Norwegian classification society.
northeaster A stormy wind with waves from the northeast. Also spelled nor'easter.
Notice of Readiness 1. Written document or telex issued by the master of a vessel to the charterer’s advising them the moment when a vessel is ready to load or discharge.2. Document advising a consignee or his agent that cargo has arrived and is ready for delivery.
Notify Address Address of the party other than the consignee to be advised of the arrival of the goods.
Notify Party The party to be notified of arrival of goods.
NRT Net registered tons. This tonnage is frequently shown on ship registration papers; it represents the volumetric area available for cargo at 100 cubic feet = 1 ton. It often is used by port and canal authorities as a basis for charges.
NT net tonnage
NUMAST National Union of Mrine, Aviation & Shipping Transport Officers
Number One: A owner boatman. Also the term for the first officer on a H.M ship.
Nun: A navigational buoy.
Nunatak: Isolated rocky peak rising from a sheet of inland ice.
NVO Non-vessel-operating common carrier, a ships agent, conducts business for the ship but does not operate the vessel.