8129 version 3
28-Jun-16
1 of 3
NAVIGATION AND SEAMANSHIP
Maintain stability on non-ballast vessel
level:
4
credit:
10
planned review date:
December 2005
sub-field:
Maritime
purpose:
This unit standard is for people in command of commercial
coastal and fishing vessels.
People credited with this unit standard are able to identify the
effects of cargo and personnel positioning on the vessel’s
stability, and position weight of the cargo to maintain stability.
entry information:
Open.
accreditation option:
Evaluation of documentation and visit by NZQA and industry.
moderation option:
A centrally established and directed moderation system has
been established by Competenz.
special notes:
1
Within the context of this unit standard and the fishing
industry, cargo includes fish.
2
Positioning of cargo (including fish) includes the loading
and discharge of the cargo, and the retrieval of fishing
nets, pots, and lines.
3
Individual vessel stability parameters are defined by,
and based on, the vessel of operation. Calculations
undertaken as part of this unit standard are based on
generic stability formula relating to:
– centre of gravity;
– centre of buoyancy;
– initial transverse metacentre.
 New Zealand Qualifications Authority 2016
8129 version 3
28-Jun-16
2 of 3
NAVIGATION AND SEAMANSHIP
Maintain stability on non-ballast vessel
Elements and Performance Criteria
element 1
Identify the effects of cargo and personnel positioning on the vessel’s stability.
performance criteria
1.1
Current and changes in vessel roll period are identified, and their impact on the
continuing stability of the vessel is ascertained.
1.2
Calculations of vessel’s stability confirm the maintenance of positive metacentre
height.
Range:
calculations – mathematical estimate, visual estimate.
1.3
The impact on the future stability of the vessel of the effect of the positioning of
weight is identified.
1.4
Calculations relating to centre of gravity, centre of buoyancy, and initial
transverse metacentre are undertaken in accordance with industry formula.
element 2
Position weight of the cargo to maintain stability.
performance criteria
2.1
Weight distribution and cargo positioning maintain the vessel’s stability within
the vessel’s defined parameters.
2.2
Loading and transfer activity maintain the vessel within stability parameters and
safe loading limits.
Range:
2.3
cargo – liquid cargo, or container cargo, or fish, or stock;
load limits – defined by vessel design and function;
transfer activity – loading and discharge, movement during
voyage.
Actions are initiated to, and result in, the minimisation of free surface effect.
 New Zealand Qualifications Authority 2016
8129 version 3
28-Jun-16
3 of 3
NAVIGATION AND SEAMANSHIP
Maintain stability on non-ballast vessel
2.4
Freeboard and reserve buoyancy are maintained within the vessel’s safe
operating limits.
Comments on this unit standard
Please contact Competenz qualifications@competenz.org.nz if you wish to suggest
changes to the content of this unit standard.
Please Note
Providers must be accredited by the Qualifications Authority or a delegated interinstitutional body before they can register credits from assessment against unit standards
or deliver courses of study leading to that assessment.
Industry Training Organisations must be accredited by the Qualifications Authority before
they can register credits from assessment against unit standards.
Accredited providers and Industry Training Organisations assessing against unit standards
must engage with the moderation system that applies to those standards.
Accreditation requirements and an outline of the moderation system that applies to this
standard are outlined in the Accreditation and Moderation Action Plan (AMAP). The
AMAP also includes useful information about special requirements for providers wishing to
develop education and training programmes, such as minimum qualifications for tutors and
assessors, and special resource requirements.
This unit standard is covered by AMAP 0054 which can be accessed at
http://www.nzqa.govt.nz/framework/search/index.do.
 New Zealand Qualifications Authority 2016