Updated 22 July 2011

Oleh Mas Edy

ABS American Bureau of Shipping
AHV Anchor handling vessel
AVM Automatic vessel management
BV Bureau Veritas
CCTV Closed circuit television
DARPS Differential absolute and relative positioning system
DG Diesel generator
DGPS Differential Global Positioning System
DNV Det Norske Veritas
DP Dynamic positioning
DPS DP specialist or
DPS-1, 2 3 ABS DP classification
FMEA Failure modes and effects analysis

FPSO Floating production storage and offloading
FSVAD Flag state verification and acceptance document
GL Germanischer Lloyd
ICS Integrated control system
IMCA International Marine Contractors Association
IMO International Maritime Organization
KR Korean Registry
LR Lloyd’s Register
MRU Motion reference unit
MSC IMO Maritime Safety Committee
MSC Circ. IMO Maritime Safety Committee circular
NI Nautical Institute
NORSOK Norsk Sokkels Konkuranseposisjon (Norwegian Technology Standards Institution)
OIM Offshore installation manager
OLF Oljeindustriens Landsforening (Norwegian Oil Industry Association)
OSV Offshore supply vessel
PMS Power management system
PRS Position reference system
PSV Platform supply vessel
STCW International Convention on Standards of Training, Certification & Watchkeeping for
TBL Teknologibedriftenes Landsforening (Federation of Norwegian Manufacturing Industries)
TLP Tension leg platform
UKOOA UK Offshore Operators Association (now Oil & Gas UK)
USCG United States Coast Guard
UMS Unmanned machinery spaces


Ancillary operations: Supply vessel operations involving the transfer of deck, dry bulk and liquid cargoes, or any other marine surface operations such as, for example, anchor handling and supply to a pipelaying vessel.
Available (system): A system that is capable of operating.
Capability plot: Provides an indication of a vessel’s DP station keeping ability expressed in a
common format.
DP class notation: Notation used by classification societies in grading DP vessels, based on IMO equipment class principles.
DP footprint plot: A plot designed to record the observed movement of the DP vessel from its desired target location over a period of time.
DP incident: Any unexpected loss of position and/or heading; or an unexpected loss of functionality or availability of equipment which results in a reduced level of redundancy leading to a degraded operational status; or when the DP system performance differs from the operator’s expectations.
DP OSV: A PSV, AHV or towing vessel which automatically maintains its position (fixed location or predetermined track) by means of thruster force, as defined in MSC Circ.645.
Other operations may be undertaken by this type of vessel and, unless there is other more relevant guidance, these guidelines should still be applied where appropriate in those cases.
DP system: The complete installation necessary for dynamically positioning a vessel and
comprising the following sub-systems as defined in MSC Circ.645: 1) power system, 2) thruster system, 3) DP control system.
Equipment class: The classification listing used in IMO MSC Circ.645 to grade the equipment
capability of DP vessels comprising the following classes: DP class 1, DP class 2 and DP class3.
Hazmat: Hazardous materials.
Lee side: Position where any combination of environmental forces through wind, waves,
swell, wave drift, surface current, surge current, tidal current, as well as changes in those factors, would move the vessel away from the installation.
Offshore installation: Fixed or mobile structure, vessel or unit used in the offshore oil and gas industry for the exploration, exploitation, storage or transfer of hydrocarbons, or as locally defined.
Online: Actively interfaced with the DP system.
Operating (system): A system that is running online.
Redundancy: The ability of a component or system to maintain or restore its function, when
a single failure has occurred. Redundancy can be achieved, for instance, by installation of multiple components, systems or alternate means of performing a function.
Weather side: Position where any combination of environmental forces through wind, waves, swell, wave drift, surface current, surge current, tidal current, as well as changes in those factors, could move the vessel towards the installation.
Worst case failure: The identified single failure mode in the DP system resulting in maximum effect on DP capability as determined through FMEA study.