28. Trackpilot
28-14
28.5.6 Arriving to a waypoint
Automatic route steering navigation tries to keep the ship always inside the channel limits and go to a next
waypoint. At the “pre-warning point”, the visual indication “2485 Route: WP prewarning” appears on the ECDIS
display and the ACKN. WARNING button on the Trackpilot lights.
At the “approach point”, the operation that will occur depends on if you acknowledged the preceding
acknowledgeable visual indication “2485 Route: WP prewarning”.
If you acknowledged the alarm 2485 then, at the approach point, the acknowledgeable visual indication “2451
Route: WP approach alarm” appears on the ECDIS display and the ACKN. WARNING button on the Trackpilot's
control panel lights. If you do not acknowledge alarm 2451 before wheel over point, the alarm 2451 will be changed
from an acknowledgeable visual indication to an audible alarm.
If you did not acknowledge the alarm 2485 at the approach point, the alarm “2451 Route: WP approach alarm”
appears on the ECDIS display and the ACKN. WARNING button on the Trackpilot’s control lights and the buzzer
sounds.
TURN IS ALWAYS ENABLED. THE ONLY WAY TO DISABLE THE AUTOMATIC TURN IS TO CHOOSE
ANOTHER STEERING MODE.
Note that these alarms are programmable (the time before you reach a turn) and it is relative to the starting point of
the manuever). See the figure below for description.
forwarding
distance = f
Wheel Over Point
WOP
radius
Approach
Point
Prewarning
point
end of turn
Waypoint
WP
WP prewarn
alarm time
WP approach
alarm time
As soon as the ship arrives to the wheel over point, the ECDIS sends a new course command to the Trackpilot and
the corresponding manuever is initiated. During a manuever, both the radar display and the ECDIS display show the
Curved EBL, indicating the planned radius for manuever.
Go to WP
When the “pre-warning point” is passed in the “Go to WP”
mode and the acknowledgeable visual indication “2485 Route:
WP prewarning” is acknowledged at the control panel of the
Trackpilot, the text “Ass. Appr. Enabled” appears in the route
monitor window of the ECDIS display.
Go to Track
When the “pre-warning point” is passed in the “Go to Track”
mode and the acknowledgeable visual indication “2485 Route:
WP prewarning” is acknowledged at the control panel of the
Trackpilot, the text “Track Appr. Enabled” appears in the route
monitor window of the ECDIS display.
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