scope:

This Part of this International Standard outlines alternatives to the default method. Some will result in lower overall accuracy but increase applicability of the standard. Others may result in same or higher overall accuracy but include elements which are not yet broadly used in commercial shipping. The general principles outlined and performance indicators defined are applicable to all ship types driven by conventional fixed pitch propellers, where the objective is to compare the hull and propeller performance of the same ship to itself over time. This document presents alternatives to measurement parameters (primary and then secondary) in Clause 4, then alternatives to measurement procedures (including alternative reference and evaluation periods) in Clause 5, describes the calculation of Performance Indicators in Part 6, and finally the estimation of Performance Indicator accuracy in Part 7. The structure used duplicates the structure of Part 2 of this International Standard to facilitate cross-reference between the two documents. NOTE Support for additional configurations (e.g. variable pitch propellers) will, if justified, be included in later revisions of the standard