2.1 For the purpose of these recommendations the terms used have the meanings defined
hereunder:
.1  Mobile offshore units (MOUs) means vessels which can be readily relocated and which can perform an industrial function involving offshore operations other than those traditionally provided by vessels covered by chapter I of the 1974 SOLAS Convention. Such MOUs include at least the following:
- column-stabilized unit is a unit with the main deck connected to the
underwater hull or footings by columns or caissons;
- non-self-propelled unit is a unit not certified to navigate independently;
- self-elevating unit is a unit with movable legs capable of raising its hull
above the surface of the sea;
- self-propelled unit is a unit certified to navigate independently;
- submersible unit is a unit with a ship shape, barge-type or novel hull design (other than a self-elevating unit) intended for operation while bottom bearing; and
- surface unit is a unit with a ship- or barge-type displacement hull of singleor multiple-hull configuration intended for operation in the floating condition.
.2  Mobile offshore drilling unit is a unit capable of engaging in drilling operations for
the exploration for, or exploitation of, resources beneath the sea-bed such as liquid or
gaseous hydrocarbons, sulphur or salt.
.3  Drillship is a self-propelled ship-shape monohull surface mobile offshore drilling
unit.
.4  Mobile offshore accommodation unit is a unit the primary purpose of which is to
accommodate personnel working offshore.
.5  Other mobile offshore unit is a unit which may be involved in any single activity or
combination of activities such as:
- construction;
- maintenance (including the maintenance of wells);
- lifting operations;
- pipe-laying and related operations;
- emergency / contingency preparedness, including fire-fighting;
- offshore production systems; and
- diving.
 Mobile offshore units do not include vessels such as:
- supply vessels;
- standby vessels;
- anchor-handling vessels;
- seismic vessels; and
- ship-shape monohull diving support vessels.
.6  Maritime safety training means training with respect to safety of life at sea,
including personal and group survival.
.7  Emergency preparedness training means training which prepares individuals to
respond adequately and safely to anticipated emergency situations.
.8  Offshore installation manager (OIM) means a competent person appointed in
writing by the owner as the person in charge, who has complete and ultimate
command of the unit and to whom all personnel on board are responsible.
.9  Barge supervisor means a person who may provide support to the OIM in certain
essential marine matters. The barge supervisor on some MOUs may be referred to as
the stability section leader or barge master.
.10  Ballast control operator means the person assigned responsibility for the normal
day-to-day control of trim, draught and stability.
.11  Maintenance supervisor means the person assigned responsibility for the inspection,
operation and testing, as required, of all machinery and equipment as specified by the
owner of the MOU. The maintenance supervisor on some MOUs may also be
referred to as the chief engineer, technical section leader or rig mechanic.
.12  Special personnel means all persons carried on board a mobile offshore unit in
connection with the special purpose of the unit or with special work being carried out
on the unit, and who are neither seafarers nor directly or indirectly paying passengers.
.13  Maritime crew comprises the OIM, barge supervisor, ballast control operator and
maintenance supervisor as well as other deck and engineer officers, radio operators
and ratings as defined in regulation I/1 of the STCW Convention, as amended.
.14  Mode of operation means the condition or manner in which a unit may operate or
function while on location or in transit. The modes of operation of a unit include the
following:
- Operating conditions: conditions wherein a unit is on location for the
purpose of conducting operations, including drilling and production activities,
and wherein combined environmental and operational loadings are within the
appropriate design limits established for such operations. The unit may be
either afloat or supported on the sea-bed, as applicable.
- Survival conditions: conditions wherein a unit may be subjected to
environmental loadings in excess of those established by the unit's operating manual. It is assumed that routine operations will have been discontinued due to the severity of the environmental loading. The unit may be either afloat or supported on the sea-bed, as applicable.
- Transit conditions: conditions wherein a unit is moving from one geographical location to another.
- Combined operations: operations in association with, or in close proximity to, another mobile offshore unit or offshore installation, where conditions on the other unit or installation may have an immediate impact on the safety of the unit; for example, a mobile offshore drilling unit attached to a fixed platform.
.15  Muster list means the list prescribed by an international convention or recommendation which applies to the unit. If no convention or recommendation applies, it means a similar list which indicates essential information on actions to be taken in the event of an emergency, in particular the station to which each person should go and the duties which that person should perform including the designation of individual responsibilities for the safety of others.
.16  Administration means the Government of the State whose flag the MOU is entitled to fly.
.17  Coastal State Administration means the Government of the coastal State concerned
in cases where a MOU is engaged in exploration for, or exploitation of, the sea-bed and subsoil thereof, adjacent to the coast over which the coastal State exercises sovereign rights for the purposes of exploration and exploitation of their natural resources.