The Windmill Harbour MOA fee for a 48' slip is $3,665 per year. The POA fee is $728 per year. This 48' slip is an end slip. Windmill Harbour is the only locked marina on the east coast that opens directly onto deep water - the ICW. Home of the SC Yacht Club, WH was just given the Island Packet Reader's Choice Award for BEST MARINA! Lock is 75' long; 19' wide. Harbour is tide free with a constant 8' depth.