Ertuğrul is an autonomous unmanned surface vehicle built on a stable catamaran platform for reliable operation in dynamic marine environments. Designed through detailed hydrodynamic and structural analyses, the vehicle delivers stability, durability, and performance under competitive conditions. It integrates a multi-sensor perception system combining camera and LiDAR data, enabling accurate object detection through sensor fusion. Autonomous behavior is managed by a state machine–based control architecture that supports robust decision-making and motion planning. Ertuğrul also features a vision-guided autonomous shooting system with stepper-motor actuation for precise target engagement, making it a competition-ready and mission-capable platform.