Detailed inspection of mooring systems in deep water is not easy, to say the least. As a safety critical element of an offshore floating unit, it is critical to understand the performance and degradation, if any, of the system. There is a consensus within the offshore industry that monitoring of the mooring system is important. Monitoring methodologies and devices have been developed and applied to some mooring systems. A certain level of requirements for a monitoring of mooring systems appears in standards and class societies' rules. However, gaps exist between the applications of the monitoring systems. This paper is to provide a review of the state-of-the-art in monitoring of mooring systems with particular focus on the effectiveness of monitoring methods that may depend on the characteristics of a mooring system, objectives, and many other conditions. Specifically, the influential parameters for the performance of mooring systems at a given environmental site and for different types of mooring systems are studied.

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