The BalMarGrav project, co-financed under the Interreg Baltic Sea Region 2021-2027 program, aims to improve the insufficient mapping of the marine gravity field in the southern and eastern Baltic Sea region. This task is very important due to the decision of the Baltic Sea Hydrographic Commission to implement a common height reference system (Baltic Sea Chart Datum 2000) for the Baltic Sea Region which is consistent to the European height system. This means that bathymetric measurements, nautical charts etc., which are needed for safe navigation, offshore infrastructure and sea traffic management, will be based on a so-called geoid model, just determined by measurements of the Earth's gravity.

New marine gravity measurements to modern standards are very costly and time-consuming.  The BalMarGrav project involves organisations from 8 countries of the Baltic Sea region (11 partner institutions) to jointly rework gravity measurements made in the 1960s-80s in the southern and eastern parts of the Baltic Sea. These campaigns were mainly carried out with the support of the Soviet Union's research infrastructure. During the period of independence from the Soviet Union and the political transition, much of this data was forgotten or underutilised.

The BalMarGrav project is building up a transnational network of experts in the region to save and reprocess the fragmented historical gravity data and provide harmonized and validated open data products to the target groups: national sectoral agencies responsible for geodetic reference systems and national gravimetric databases, international governmental organisation (e.g. Baltic Sea Hydrographic Commission), nongovernmental organization (e.g. Nordic Geodetic Commission), as well as marine geophysical exploration companies and scientific community.