I am talking to a Science Museum about constructing an unmanned boat to navigate a waterway. It would be a fun way to introduce this sort of automation to the public. As this waterway is surrounded by trendy shops, bars, restaurants and condos, we are also thinking of doing advertising using LED and/or LCD displays to promote the science center. At night, there is very little traffic. The little traffic there is is from one or two ferries. For navigation, I am thinking of a GPS, of course, and ultrasonic range finders to avoid collisions. Any comments are welcomed. Thank you!