This paper discusses accuracy issues and measurement complications related to acquiring data during standard ship trials. Recent Institute for Ocean Technology (IOT) experience using a modern trials instrumentation capability during seakeeping, propulsion and manoevring trials on a small monohull will be discussed at length with a description of the measurement techniques and calibration procedures used, problems encountered, the source of accuracy uncertainties and some general ship/model correlation issues. The paper is designed to stimulate discussion and promote debate for the benefit of all researchers involved in ship performance assessment.

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