6.2.3 Presentation
Logically related values such as preset and actual values should be displayed as a pair of data.
7 Interfacing
7.1 Sensors
The track controller should be connected to position, heading and speed sensors which meet the standards of the Organization. The heading measurement system should be a gyro-compass.
7.2 Status information
All connected sensors should be able to provide status, including failure information.
7.3 Standards
The track control system should be capable of digital, serial communication with the ship's navigation system and comply with the relevant international standards.*
8. Fall-back arrangements
8.1 Failure of the track control or position sensor
(1) If the heading control is still available then the system should automatically switch over to heading control and take the actual heading as the preset heading for the heading control.
(2) If the heading control is not available the rudder angle should be maintained.
8.2 Failure of the heading measuring system
(1) The actual rudder angle should be maintained.
The associated alarms are stated in section 5.3.
*IEC1162
