Commercial passenger vessel in Fiordland harbour assessed during a pre-purchase inspection by marine surveyors NZ, supporting marine consultancy service, vessel management and MNZ Surveyor compliance.

Marine Surveying, Design & Consultancy

About Us

MDSS is a modern Marine Survey, Naval Architecture and Marine Consultancy company providing practical solutions to the maritime industry.

We are based in New Zealand and travel domestically and internationally to meet our clients’ needs wherever we are required. Our service locations within New Zealand include Auckland, Nelson, New Plymouth, Queenstown, Taupo, Tauranga, Te Anau, Wellington, and Whangarei.

Founded by Patrick Clissold, an ex-Royal Navy marine engineering officer, the company benefits from his over 20 years of marine industry experience, encompassing naval design, vessel management and marine survey.

What we do

Marine Surveyor

Surveying services are carried out under the Maritime Operator Safety System (MOSS) in New Zealand and the Australian Maritime Safety Authority (AMSA) system. MDSS offers periodic MOSS surveys, AMSA surveys, initial and in-construction inspections, as well as specialist surveys such as MARPOL Annex VI and Load Line.

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What we do

Naval Architecture & Design

Design approval, stability analysis, design reviews, vessel tender documentation and ship system design. MDSS’s team of naval architects and experts in naval design and marine design works with vessels ranging from large ocean-going ships to small trailer boats. Our services support compliance with Australian Maritime Safety Authority (AMSA) and MNZ Surveyor standards.

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What we do

Marine Consultancy

MDSS offers expert maritime consultancy services and practical guidance as a trusted marine consultant. Our solutions support comprehensive vessel management, including long-term reliability improvements and regulatory compliance. We specialise in consultancy services such as asset management planning, maintenance and docking planning, FMEA, compartment scanning and modelling, and providing support with MNZ MTOP and compliance requirements.

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Clients

MDSS has provided services for a wide range of organisations, including port authorities, operators, government agencies, and marine trusts, through tailored marine consultancy solutions.