An Arduino based prototype about helping beginner windsurfers catch what is called the “down wind”. The project was done in a team of two people. Windsurfers need to catch the wind that is behind them in order to start sailing and this could be difficult for people who are starting with this sport. This knowledge was provided by my team mate in this project, who is a windsurfer. The device would be a part of the sail and would catch the wind in the little opening, signaling with the LED, that the current position of the surfer is suitable for sailing. My contribution to the project was building the internals of the device and programming the micro-controller.