A braking system for a watercraft moving upon a body of water. At least one secret code is recorded into the smart card at the location of the election authority at the moment when the latter delivers the smart card, the secret code having to be input by the voter into the host computer when the voter wants to vote during an election in order for the vote to be transmitted to the election authority and validated by the election authority. The GUI is updated continuously in near real time. The set-top box receives an address from the discovery server that identifies the switched video manager that is associated with the assigned service group.