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This document provides best-practice guidance on the installation and alignment of propulsion reduction gears in ships and smaller marine vehicles including the small craft of all power levels. The guidelines in this bulletin are written to address any type of vessel regardless of the type of prime mover or fuel source. This guide is intended to assist users in applying standards and to allow the vessel owner, designers, and builders to work together with gear designers and suppliers to achieve practical and successful installations. References are made to applicable standards with the focus on providing an understanding of the important elements to consider and how to best go about achieving successful installations with reliable lasting performance.