Where can I find info about ferries?

The ferry connections across the IJ river are free for passengers, bicyclists and moped riders. The ferries are in service all day and all night. 

Noordzeekanaal ferries

Motorized vehicle drivers must pay for the ferry trip crossing the Noordzeekanaal: the Hempont, Velserpont, and the Buitenhuizerpont. Pedestrians, cyclists, moped riders, and other slow traffic travel for free on the ferries.