5.1.14 Manual change over from track control to heading control
(1) Any change over from track control to heading control should be possible under all conditions.
(2) The heading control system should take over the actual heading as the preset heading.
(3) Any switching back to track control should require operator intervention.
5.1.15 Steering mode indication
Adequate indication should be provided to show which method of steering is in operation.
5.1.16 Heading monitoring
Heading monitoring should be provided to monitor the actual heading information by independent heading sources. The heading monitor is not required to be an integral part of the track control system.
5.2 Accuracy
5.2.1 A short qualitative description of the effect of:
.1 the accuracy of the sensors for position, heading and speed;
.2 changes of course and speed;
.3 actual speed through the water; and
.4 environmental conditions
to the track control system should be provided to the user in appropriate documentation.
5.3 Alarms and indicators
5.3.1 Failure or reduction in power supply
In case of failure or reduction of power supply to the track control system which effects its safe operation an alarms should be given.
5.3.2 Position monitoring alarm
An alarm should be given when the position monitor detects a deviation beyond a preset limit.
5.3.3 Heading monitoring alarm
An alarm should be given when the heading monitor detects a deviation beyond a preset limit.
