Symmetric spinnakers have the windward clew secured to a spinnaker pole. On these yachts, there are two sheets attached to the clew of the jib. Bowlines and clew lines shape a square sail. The clew (back corner) of the sail attaches to the free end of the boom. These become the new tack and clew. A spritsail has four corners&colon; the throat, peak, clew, and tack. The clew may be wire-guided to limit lateral play. This tragedy occurred when a boat overturned in Clew Bay, drowning thirty-two young people. Also, "Gran Grin" was wrecked at the mouth of Clew Bay. SLEW and CLEW are not compatible waveforms. Her other strongholds were at Rockfleet Castle (on Clew Bay) and Carrickkildavnet Castle. In 1894, the harbour was the scene of the Clew Bay Drowning.