The rails (deck topsides or gunwales) are 10 inches wide at the beam. By attaching outriggers to the gunwales, the oarlocks could be placed farther out. It was used for the gunwales of Polynesian voyaging canoes. Poles used for the gunwales are fastened to these stakes. The last steps in construction is to install the seats, thwarts, and gunwales. The gunwales on many were nearly straight from bow to stern. Deck molded-in nonskid, wide gunwales (rails). Open gunwales are mahogany with a D-outwale. They could sail low in the water, even with their gunwales beneath the surface. On ordinary rowing craft, the rowlocks are attached to the gunwales. At the time "Carpathia" arrived, the lifeboat's gunwales were almost covered by water. The gunwales were center-to-center. In Achill Island the currach is built with double gunwales.