The APACHE3 is a portable shallow-draft hull with a single-beam echo sounder for bathymetric surveys of lakes, inland rivers, and coastal areas. The master control unit provides seamless 4G communication, removing the limitations of traditional network bridge base stations and transmission distances, and making hydrographic survey easier. The APACHE3 USV combines a dual GNSS positioning and heading sensor, a stable and reliable hull attitude, and an IMU sensor, allowing uninterrupted survey while passing below bridges. The high efficiency five m/s motors and absolute straight-line technology allow a fully automatic pre-determined course in autonomous mode under adverse current and flow conditions.