Republic of Ireland legislation. RI 2020/589. Merchant Shipping (Navigation and Tracking) (Heading Systems and Testing of Steering Rear) Rule. Published 8th December. These Rules implement Chapter V of the International Convention for the Safety of Life at Sea (SOLAS) 1974 relating to the use of heading and track control systems and the operation and testing of steering gear. The Rules revoke RI 1983/317 the Merchant Shipping (Automatic Pilot and Testing of Steering Gear) 1983.