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In order to close energy efficiency gaps in shipping and thus support climate targets, there is a need for a clear understanding of seafarers and how they perform route planning, especially with regard to energy efficiency. The aim of this study is to develop a hierarchical task analysis of route planning, an expected value assessment of these tasks, and to investigate factors that potentially influence seafarers' motivation to perform these tasks. To this end, we have developed a task analysis based on the required guidelines and additional iteration by domain experts, and are now planning an online survey of nautical officers (N = 110) who assessed the expectancy of success, subjective value, and perceived cost of these tasks, as well as self-assessments of psychological need fulfilment and locus of control. In addition, they assess their motivation for energy-efficient route planning and their preferences for automated systems or manual control when implementing energy-efficient route planning.