Eire’s Marine Casualty Investigation Board says that failure of the leading lights at Roonagh Pier were the main cause of the grounding of the passenger ferry Pirate Queen but further investigations revealed serious weaknesses in the navigational procedures and practices on the company vessels. There appeared to be an over reliance on visual aids to
navigation and a neglect to practice and use the electronic aids on board.
On the evening of 20th December 2011 the inter island passenger ferry Pirate Queen grounded on rocks at the entrance to Roonagh Pier, Co. Mayo. The vessel was refloated shortly afterwards and although not holed, it had sustained severe structural damage. Two of the passengers were taken off the ferry whilst she was on the rocks and transferred to the pier by a rigid inflatable boat. One passenger sustained injuries during the incident.