29. Steering With Yokogawa PT-500A
29-12
29.7 Expected Steering Performance Under Various
Conditions
The system has many available steering modes. Below is a summary of effect of various environmental conditions
29.7.1 Expected steering performance for going ahead
Environment conditions Heading control = “AUTO” Track = “NAVI”
Calm sea, no wind, no current COG is about the same as Set
Course in Auto Pilot
Drift compensation set as ON or OFF:
vessel follows monitored route
Moderate wind and/or current Vessel has a tendency to drift Drift compensation set as ON:
vessel follows monitored route
Drift compensation set as OFF:
vessel follows monitored route in an offtrack
position inside the channel limit
High wind and/or current Vessel is drifting Drift compensation set as ON:
vessel follows monitored route
Drift compensation set as OFF:
vessel may have troubles to follow monitored route
inside the channel limit
Slow change of wind and/or current
There is no compensation for
change
Drift compensation set as ON:
vessel follows monitored route, but may need full
channel limit area
Drift compensation set as OFF:
vessel may have troubles to follow monitored route
inside the channel limit
Sudden change of wind and/or
current
(For example sudden change from no
current to 5 kt current perpendicular
to track)
There is no compensation for
change
Drift compensation set as ON:
vessel follows monitored route, but may need full
channel limit area
vessel may go outside channel limit and return back
inside channel limit
Drift compensation set as OFF:
vessel may have troubles to follow monitored route
inside the channel limit
Slow change of speed There is no compensation for
change
Drift compensation set as ON:
vessel follows monitored route
Drift compensation set as OFF:
vessel may have troubles to follow monitored route
inside the channel limit
Fast change of speed
(For example speed decrease from 20
to 7 kt)
There is no compensation for
change
Drift compensation set as ON:
vessel follows monitored route, but may need full
channel limit area
vessel may go outside channel limit and return back
inside channel limit
Drift compensation set as OFF:
vessel may have troubles to follow monitored route
inside the channel limit
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