There were sections of the lesson where the sound did not appear and therefore you had to read. The lesson would also freeze up numerous times and you would have to go back to the previous screen and watch that again to continue. I am a 50 year experienced boater but I learned a lot from the course. It was very extensive and educational. Suggestion would be after a person passed the entire exam display those questions that a person got wrong. If they got a question wrong there is no way to know what the correct answer would be. After all it is supposed to be educational.