 Only maritime pilots trained and employed by the district are authorized to bring vessels beyond a certain size into the bay, unless a ship's pilot has proper certification.The Humboldt Bay District maintains a 237-berth marina at Woodley Island, serving both recreational and commercial boats and a shipping dock located in South Bay.Dangerous sand bars and shifting currents have caused many shipwrecks at the entrance to Humboldt Bay, particularly during the late nineteenth century.