For numerous existing ships, reducing fuel consumption is achieved mainly by applying operational measures rather than technical measures. This paper outlines the operational approaches for energy efficiency enhancement. Methodologies for calculating greenhouse gas emissions or fuel consumption are presented from three perspectives: international maritime transports, regional or national shipping, and individual ships. A description model between EEOI and environment factors or service conditions was developed. It is suggested that the energy efficiency management should be planned on the base of the relationship model between ship energy efficiency and input variables.
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