The Echosounder Measurement and Testing System is designed to ensure the highest accuracy for depth measurement instruments in hydrographic and maritime applications. It integrates components such as a sound velocity sensor, electronic level, RTK GPS receiver, and a signal processing unit with specialized BTMS software to conduct real-world testing, data analysis, and standardized reporting. The system is rugged, precise, and fully compliant with international standards, making it ideal for calibrating single-beam and multibeam echosounders under field conditions.