This chapter introduces a vehicle vision navigation system designed for autonomous navigation in both agricultural and road environments. The system integrates onboard image acquisition, visual target-line detection, steering-angle sensing, and closed-loop steering control. Using camera-based perception and Hough-transform-based navigation-line extraction, the system generates real-time path-tracking commands without relying on GNSS signals. Hardware components include an industrial computer, camera, angle sensor, and steering-wheel actuation mechanism, while software modules provide navigation-line detection and steering control. Field experiments demonstrate that the system achieves centimeter-level tracking accuracy and robust performance across diverse agricultural operations and road conditions.