The requirement was to make a navigation and control system for a underwater remotely operated vehicle (ROV), with features like heading hold, position hold, way point navigation etc. The system uses a 10 DOF IMU for heading, orientation and position information. Additionally a depth sensor amplifier is included to enable the ROV to dive to specific depths at specific way points. The board has a USB interface for debugging and programming and a RS232 interface for control in the field. The board also has drivers for two high power LEDs, whose intensity can be controlled using PWM signals. Keeping the heat dissipation from the board was a challenge because the board was to be placed in a water tight container, making any possibility of a ventilation impossible.