The availability of modern programmable calculators permits the development of low cost performance monitoring systems for onboard use on ships. Any system developed must be acceptable to normally qualified marine engineers, and a simple system using existing ship’s instrumentation to produce trend plots has been developed. Although extremely simple in concept, a diagnostic capability is provided; the level to which diagnosis can be carried out is dependent on the level of instrumentation provided. Tests have been carried out both on shore and at sea and the system shows great promise.

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