Millions of visually impaired people enjoy swimming but face risks such as collisions and disorientation. Around 40% have experienced these issues, leading to injuries, posture problems, and energy loss. To address these challenges, we developed a smart swimming aid featuring an X-shaped back harness and vibration feedback. It offers three functions: obstacle detection, directional guidance, and posture correction. The device provides real-time feedback, helping users sense obstacles, stay on course, and adjust posture.