Defines the structure, performance, inspection and testing of heading control systems to be installed on board craft operating under the following conditions: a) Speed exceeding 30 kn and up to 70 kn; b) Maximum rate of turn 20 degree/s; c) Normal range of operation between 70 degree N and 70 degree S should, as required by chapter 13 of the HSC Code, comply with the minimum performance requirements specified in these standards. Applies to the heading control systems which enable a craft to keep a preset heading with minimum operation of the craft's steering gear, within limits related to the craft's manoeuvrability in conjunction with their sources of heading information.