The Tboat20-D is Toknav's patrol variant of the Tboat20 unmanned surface vessel, built on a 1280x580x430mm composite (polyester carbon fiber/Kevlar) monohull weighing about 40kg total. It is fitted with a single-beam echo sounder (200kHz, 5-degree beam, 0.15-300m depth range) and can carry a side-scan sonar payload for underwater imaging while patrolling waterways. It also includes a 360-degree night-vision camera and remote-control operation, consistent with the broader Tboat20 series specs.