This guideline has been drawn up in cooperation between the Finnish Transport and Communications Agency Traficom as well as the Finnish Transport Infrastructure Agency. The guideline discusses issues to be taken into account in the coordination of maritime transport and wind farms, in which the roles of Traficom and the Finnish Transport Infrastructure Agency involve issuing statements or instructions and advice related to the matter as authorities, as well as cooperation with other authorities and interest groups. The aim of the guideline is to describe the procedures of Traficom and the Finnish Transport Infrastructure Agency during the land use planning, assessment and permit processes of planned offshore wind farm projects and provide background for the requirements of the agencies on taking maritime transport and its infrastructure into account in wind power projects.