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8. CHART ALERTS
The ECDIS can detect areas where the depth is less than the safety contour or detect
an area where a specified condition exists. If prediction of own ship movement goes
across a safety contour or an area where a specified condition exists, the system does
the following:
• Chart objects set for Alarm category are highlighted in red on the chart (for checking
planned route, navigation route).
• Chart objects set for Warning or Caution category are highlighted in yellow on the
chart (for checking planned route, navigation route).
• An appropriate message appears in the Alert box for chart objects set for Alarm,
Warning or Caution category.
• Chart objects set for Alarm or Warning category are given an aural alarm.
For this function, the ECDIS utilizes the chart database (S57 charts) stored on the
SSD in SENC format. Note that the ECDIS calculates dangerous areas using the
largest scale chart available, which may not be the visualized chart.
You can choose objects that are included for calculation of danger area (for example,
restricted areas). A dialog box lists the various areas that activate danger warnings.
You can also define your own safe area by creating a user chart area. The system can
utilize these areas when calculating chart alerts.
The ECDIS can check the following for you:
• Predicted movement area of own ship
• Planned route with an easy to use locator function to find dangerous areas
The ECDIS will highlight the following for you
• Dangerous areas inside predicted movement area of the own ship
• Dangerous areas inside your monitored route
• Dangerous areas inside your planned route
Chart object set for Alarm
category is highlighted in
red.
Chart object set for Warning
or Caution category is
highlighted in yellow.
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