Questions and problems of Marine Cadastre are in the actual agenda in many European countries, and to achieve the goal, international projects are realized for this. The coastal status of the Baltic Sea is a very important element of infrastructure for all countries around the Baltic Sea. The baseline serves as the main element or reference of the Maritime Cadastre. Land parcels from the sea are registered and maintained in the Cadastre Information System. Already from 2017 in Latvia has started to register coastal areas two kilometres in width from the Baltic sea baseline. The research explores international and national legislation in Latvia and Poland related to the use of marine space, and evaluates the resources of economic growth of the territories of Baltic Sea. In research, analysed information available in section the “Human activities” in EMODnet, which could be considered possible base of marine cadastral content information, and layers of marine spatial planning that complement the information on EMODnet portal. The information used for EMODnet and maritime spatial planning is compared with the content and information of the cadastre of Greece, which in turn allow to write conclusions on the amount of data required for the Latvian and Poland marine area. The aim of the research is to obtain the appropriate and sustainable content of the marine cadastral model for the territory of Latvia and at the same time analyse experience of Poland.