Auto centring
A list of chart areas is created for one type of chart; the list created for S57 chart is valid only
for this type of charts and cannot be used with ARCS charts.
AUTO CENTRING
Click on the Auto centring icon to define a centring zone.
When the chart auto-scrolling mode is selected (Follow Ship Ticked ON), the chart will
automatically move following to the ship motion when it out of the centring zone.
There are two types of centring zones: static or dynamic according to the ship’s heading.
STATIC CENTRING ZONE
The Auto Centring button allows the user to define the ‘centring zone’ according to the ship’s
heading. For example, when a ship is heading north, the operator will define a rectangle
located at the bottom of the window in order to display a chart area as large as possible in
front of the ship. This zone is defined by default as a rectangle located in the middle of the
screen.
DYNAMIC CENTRING ZONE
Using a dynamic centring zone guaranties that the navigator always has the largest chart
displayed in front of his ship, even when the heading changes. Indeed, after the zone is
defined, the ECDIS900 will dynamically position the centring zone according to the heading.
For instance, if the ship sails North East the ECDIS900 will move the centring zone to the
bottom left of the screen and if the ship changes course to South the zone will be moved to
the centre top of the screen.
Click the Auto Centring button to display the current centring rectangle.
• Two red dotted line rectangles are drawn on the chart: the current centring zone (the
smaller rectangle) and the rectangle defining the limits of the dynamic zones.
• To leave the centring rectangle unchanged and to erase it, click on the Auto Centring
button again.
• To define a new centring rectangle, locate the cursor at one corner of the desired zone
then hold and drag to draw the appropriate zone.
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