It leaves from the City Dock at 12:30 p.m. every day. You do not need to pay for the ferry in advance; the Captain will collect the fee onboard. You may pay by cash or check.
FYI.......When you arrive at Crisfield's dock there will be three ferries. Only 2 go to Ewell, the Red and the Green Ferry. You want one of these two ferries. Tell the captain you are staying at Petite Maerin Cottage and they will deliver your baggage to the cottage and pick you up the day you leave.