4.1.1.4 A failure of one part should not affect other parts except for those functions directly dependent upon the information from the defective part.
4.1.2 Basic functions
4.1.2.1 An INS should combine, process and evaluate data from all sensors in use. The integrity of data from different sensors should be evaluated prior to distribution.
4.1.2.2 An INS should ensure that the different types of information are distributed to the relevant parts of the system, applying a 'consistent common reference system' for all types of information.
4.1.2.3 The INS(A) should as a minimum provide the information of position, speed, heading and time, each clearly marked with an indication of integrity.
4.1.2.4 The INS(B) should be able to automatically, continually and graphically indicate the ship's position, speed and heading and, where available, depth in relation to the planned route as well as to known and detected hazards.
4.1.2.5 The INS(C) should, in addition, provide means to automatically control heading, track or speed and monitor the performance and status of these controls.
4.1.3 Integrity monitoring
4.1.3.1 The integrity of information should be verified by comparison of the data derived independently from two or more sources if available.
4.1.3.2 The integrity should be verified before essential information is displayed or used. Information with doubtful integrity should be clearly marked by the INS and should not be used for automatic control systems.
4.1.4 Data exchange
4.1.4.1 Stand-alone equipment for which performance standards adopted by the Organization exist, when connected to the INS, should comply with the applicable International Standards,* for data exchange and interfacing.
4.1.4.2 Data latency should be consistent with the data requirements of the individual pans.
4.1.4.3 The integrity of data exchange within the INS should be ensured.
4.1.4.4 A failure of data exchange should not affect any independent functionality.
* IEC 61162 Series
