A domestic import-substituting portable multipurpose scientific echo sounder (MIEL) with a split beam was developed by Vector Marine Electronics Ltd, Russian Federation. The need to create a domestic echo sounder for carrying out resource surveys in shallow inland waters is due to the fact that foreign scientific echo sounders have narrow beam patterns, which does not allow them to be used at depths less than 3 meters due to small sounding volumes of water medium and hence the low representativeness of the data. In addition, the cost of such devices is not available to the vast majority of Russian scientific organizations. After the introduction of sanctions by Western countries, many foreign manufacturers have stopped selling high-tech products to our country, and those that can be supplied are practically deprived of technical support, since many representative offices in Russia were closed, and the development of any high-tech products implies close cooperation between the developer and the user. By purchasing foreign equipment, our users are deprived of contact with Western manufacturers and the possibility of upgrading and improving the acquired equipment.