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Marine Registration Services

Marine Registration Services
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Technical & engineering

Stability Booklet

Stability documentation prepared to the standard your classification society or authority requires.

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Naval architect reviewing yacht stability documentation and loading plans
Marine Registration Services

Overview

A stability booklet documents how a vessel behaves under different loading conditions and is a standard requirement for classed and commercial vessels, and increasingly requested for larger private yachts as well.

We coordinate naval architects to prepare or update stability documentation, working from existing vessel data where available or from fresh measurement and calculation where it is not.

Benefits

Prepared to the standard required by classification societies and commercial certification.

Coordinated alongside naval architecture and technical drawings work.

Supports vessels where a booklet needs updating after modification.

Clear explanation of findings, not just a technical document handed over unexplained.

Our process

  1. 01

    Requirement confirmation

    We confirm which classification society or authority standard the stability booklet needs to meet.

  2. 02

    Data collection

    Existing vessel data is gathered, or a fresh inclining test or measurement is arranged where needed.

  3. 03

    Booklet preparation

    Stability calculations and the booklet document are prepared by a qualified naval architect.

  4. 04

    Submission and sign-off

    The completed booklet is submitted for classification society or authority approval.

Required documents

  • Existing stability data or previous booklet, if available
  • General arrangement and structural drawings
  • Details of any modifications affecting weight distribution since the last booklet

Frequently asked questions

Does every vessel need a stability booklet?+

Not every vessel does, but commercial, classed, and larger vessels commonly require one. We confirm the requirement from the vessel type, use, and authority route.

Does a refit require a new stability booklet?+

A refit can require an update if it changes weight, layout, structure, machinery, or operating limits. We review the scope before advising.

What is an inclining test?+

An inclining test measures how a vessel responds to controlled weight shifts so the naval architect can calculate lightship and stability data.

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