91.Section 57 makes provision relative to navigational safety. The Scottish Ministers can issue a notice to a person if it appears that serious interference with legitimate uses of the sea is occurring, or is likely to occur, as a result of marine works. The notice can require the provision of lights, signals or other aids to navigation or the stationing of guard ships until the serious interference, or threat of interference, is removed. An emergency safety notice must state the Scottish Ministers’ grounds for believing that serious interference with legitimate uses of the sea is occurring or is likely to occur, state the date and time from which the requirements are to take effect and require the person to take such steps as the Scottish Ministers consider appropriate to ensure compliance with the requirements.