The SinoGNSS SV300 is a compact, lightweight unmanned survey vessel -- about 28 kg and small enough to fit in a car trunk -- built for single-beam bathymetric surveys down to roughly 200 m depth. It combines dual-antenna GNSS positioning with an IMU and an automotive-grade dual-battery power system, plus safety features like shallow-water auto-return, collision bumpers, and obstacle detection, making it practical for rivers, reservoirs, and harbor surveys where portability matters.