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Last updated: 14 January 2013

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NAABSA-Not Always Afloat But Safely Aground
NCAD-Notice of Cancellation at Anniversary Date
NCSA-North Coast South America
NCV-No Commercial Value
NDT-Non-Destructive Testing
NEOBIG-Not East Of But Including Greece
NEP/S-Not Elsewhere Provided/Stated
NIMA-National Imagery and Mapping Agency
NKK-Nippon Kaiji Kyokai (Japanese Classification Society)
NLS-Noxious Liquid Substances
NMEA-National Marine Electronics Association
NOAA-The United States National Oceanic and Atmospheric Administration
NOE-Notice of Exception
 -Not Otherwise Enumerated
NOP-Not Otherwise Provided
NOR-Notice Of Readiness
NORA-Notice Of Readiness Accepted
NORT-Notice Of Readiness Tendered
NOS-Not Otherwise Specified
NPA-National Petroleum Association
NR-No Risk
NRAD-No Risk After Discharge
NRT-Net Registered Tonnage
NS-Nuclear Ship
NSA-Non-Separation Agreement
NSPF-Not Specially Provided For
N/T-New Terms
NT-Net Tonnage
NTM-Notice to Mariners
NUC-Not Under Command
NVO-Non-Vessel Operating
NVOC-Non-Vessel Owning Carrier
NVOCC-Non-Vessel Owning Common Carrier
NWE-North West Europe
NYPE-New York Produce Exchange form
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OAOK-Over Age OK
O/C-Open Charter
 -Ore Carrier
OCIMF-Oil Companies International Marine Forum
OCP-Over Common Point
OD-Outside Diameter
ODME-Oil Discharge Monitoring Equipment
ODP-Offshore Drilling Platform
OH-Off Hire
OHBC-Open Hatch Bulk Carrier
 -Owner's Option
OOG-Out Of Gauge
OOW-Officer On Watch
OPA-Oil Pollution Act
OPEC-Organisation of Petroleum Exporting Countries
OPL-Off Port Limits
OPRHNS-Protocol on Preparedness, Response and Co-operation to Pollution incidents by Hazardous and Noxious Substances
OR-Owner's Risk
ORB-Owner's Risk of Breakage
ORC-Owner's Risk of Chafing
ORD-Owner's Risk of Damage
OS-Ordinary Seaman
OSB-One Safe Berth
OS&D-Over, Short and Damage (report)
OSD-Open Shelter Decker
 -Oil Spill Dispersant
OSP-One Safe Port
OSRA-Ocean Shipping Reform Act
OSV-Offshore Supply Vessel
OT-On Truck
 -Oil Tight
OWS-Oily Water Separator
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