Given the CHEK technologies applied to the baseline of CHEK Project, planning is one of the main constraints related to emissions reduction. A good Itinerary, to be considered as such, must balance nautical, engineering, and Commercial / Business factors. As today a complete system that gathers all these variables together, values them, compares them, and gives as an outcome a result that identify and weight the proficiency; in all the above-mentioned aspects, of an itinerary, does not exist as single entity. This is causing operational issues to the ship Owners / ship Operators, and the risk of creating itineraries viable from the commercial point of view but not fully compliance with emissions targets and related operational indexes is realistic and must be mitigated. The objective is to mitigate this risk, by creating and integrating with systems onboard a tool based on an algorithm that will be able to evaluate a mathematical ship model and to proceed with a process to calculate the optimal itinerary from a holistic point of view. The first part of this work focuses on the integration of the tool with the route planning existing onboard the vessel. The proof of concept is provided through practical case. The report proves the integration of the cruise itinerary optimisation tool into the cruise navigation system through the route planning system. Whilst the first step was the tool proof of concept including integration with other systems, the functionality of the tool itself will be addressed in upcoming CHEK reports.