5.1.7 Change of waypoints
In the case of track control by a pre-planned sequence of waypoints, it should not be possible to modify the TO-waypoint, the FROM-waypoint and the NEXT-waypoint while in the track control mode without creating a new track and until:
.1 the pre-planning of the new track is completed; and
.2 the starting requirements (Section 5.1.2) are fulfilled.
5.1.8 Turn performance
The track control should enable the ship to sail from one leg to another by turns based:
.1 on a preset turn radius; or
.2 on a radius calculated on the base of a preset rate of turn within the turning capability of the ship.
5.1.9 Adaptation to steering characteristics
The track control should be capable of manual or automatic adjustment to different steering characteristics of the ship under various weather, speed and loading conditions.
5.1.10 Permitted tolerance
Means should be incorporated to prevent unnecessary activation of the rudder due to normal yaw or sway motion and statistically scattered position errors.
5.1.11 Override function
A track control system should be able to accept a signal from the override facilities to terminate track control mode and switch to the override facilities.
5.1.12 Heading control mode
A track control system may be operated in heading control mode. In this case, the performance standards of heading control systems are to be applied.
5.1.13 Manual change over from track control to manual steering
(1) Change over from track control to manual steering should be possible at any rudder angle.
(2) Change over from track control to manual steering should be possible under any conditions, including any failure in the track control system.
(3) After change over to manual control, return to automatic control should require operator intervention.
