In the game up to six players try to be the first to visit six Dutch harbours. The harbours can be reached by land or by water. The players answer questions and save up to buy a nautical licence (vaarbewijs) or a bigger ship. But this is not as easy as it sounds. Players can encounter a storm, be arrested by the water police, or experience a technical failure.

The questions supporting the nautical exams are written by a certified instructor, thus making it possible to use the game during the course. The general questions are about a wide range of water sports related subjects, from skutjesylen to kitesurfing. Players are always asked questions from their chosen difficulty level, so the game can be played by people with and without knowledge of the nautical rules, at the same time.