Final answer:
The highest regional authority in the Regional Government of the Azores would have the final approval for the establishment of a Regional Command Post, aiming to streamline marine and maritime matters.
Step-by-step explanation:
The final approval in the establishment of a Regional Command Post would likely fall under the jurisdiction of the highest regional authority within the governmental structure in question. In the context of the Regional Government of the Azores, which is actively working to centralize authority over maritime matters to a single directorate, this decision would probably necessitate the consent of the regional legislative body or the highest-ranking official within the regional government. The aim is to streamline processes for better responsiveness to threats like NIS and marine invasions.