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This recommended DNV-GL practice aims to provide necessary recommendations on how to document that offshore fibre ropes for delivery will be fit for purpose. It provides general recommendations and information pertaining to synthetic lines intended for the offshore use. This DNV-GL recommended practice addresses three main areas: design of synthetic lines for intended offshore use, testing of performance characteristics for synthetic lines, and analysis of synthetic lines as part of an integrated system. The paper is released to provide recommendations for proper design, testing and analysis of various synthetic lines intended for use in offshore mooring systems as described in DNVGL-OS-E301, deepwater deployment/recovery systems as per the DNV-OS-E407, and any other offshore applications. Please note that the present document does not deal with the fitness of the offshore fibre ropes for the intended purpose, when in use. Here are some key aspects which this recommended practice emphasises - the ropes in question shall be analyzed based on the amount of load-bearing material in their cross-sections as well as the mechanical characteristics of the materials these ropes are made of; another aspect will be the tension vs stretch behaviour; and the last one is the endurance and strength of the synthetic/steel-wire rope...