The very best of only a few 48' boatslips available in the Windmill Harbour Marina.Windmill Harbour is the only private locked harbour and marina on the east coast that open directly onto the deep water of the Calibogue Sound (The Intracoastal Waterway or ICW). Home of the South Carolina Yacht Club (SCYC). The harbor's lock is 75' long and 19' wide. Harbour is tide-free with a constant 8' depth. Windmill Harbour is undoubtedly the safest marina on Hilton Head Island!