Section 18 Setting up the Operation Mode  18-32 
 
Setting Item  Description of Setting  Setting Value 
Border Range  Set up the range for the own ship in order to move the chart. 
This is displayed only on the ECDIS screen. 
 
•  When the own ship is sailing in the direction of the arrow 
in the figure below. 
 
 
•  If the border range you set up is 50%,   
the screen display switches when the own ship reaches a 
50% area from an edge of the screen. 
 
 
•  If the border range you set up is 70%,   
the screen display switches when own ship reaches the 
border range. 
 
While the ECDIS screen is displayed, the own ship display 
position is reset by switching RADAR Overlay from ON to 
OFF under the following conditions: 
•  RADAR Overlay: ON 
•  Motion mode: TM 
•  Own ship position: Own ship is moving. 
•  Own ship display position: Edge of the chart display area 
(position beyond the [Settings] - [Chart-Border Range] 
setting) 
This is because when RADAR Overlay is ON, the limit defined 
in the Radar standards is prioritized over the ECDIS display 
area limit. 
30 to 80 % 
Margin (Chart 
Rotation) 
When head-up, if own ship turns at the angle specified here, 
the chart will also turn. For example, if the margin is set to 
10°, the chart will turn when own ship turns 10° or more. 
0 to 90°