SPH Engineering’s sonar system is suitable for use in sea, rivers, or lakes, with main features being high productivity, easy access to hard-to-reach areas and the ability to choose from a range of single-beam/single-frequency, single-beam/dual-frequency and multi-frequency sonar systems, depending on the application. The main tool for producing depth measurements is a sonar system, installed on a DJI Matrice 350 RTK UAV.