The operation of naval gas turbines requires a professional technical supervision which cannot be provided by crews of small vessels. Therefore, it was decided to support the crews of such vessels by the ''Base Diagnostic System of Vessel's Turbine Engines'' (BDS) created at the Naval Academy in Gdynia. The paper presents general possibilities of identification of the operating states of naval gas turbines by the BDS application. The system configuration, testing means and methods are demonstrated within the paper as well. The system was implemented on the Polish Navy Vessels with turbine engines. Measuring positions, the data base constantly being updated and diagnostic software allow carrying out the operation of turbine engines according to their actual conditions.