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ECDIS-E User Guide
Basic Operation of ECDIS-E
65934012
3-45
Safety Checking
The safety checking facility provides the operator with advanced warning
that own ship may be headed towards objects or areas that could endanger
the safety of own ship, as indicated in the ENC or mariner object database.
The system periodically searches the chart database and mariner objects
database for objects that could endanger the safety of own ship. Contours,
prohibited areas, and areas with special conditions are considered
dangerous if their depth is less than own ship’s safety depth or no depth is
defined for that object.
All objects above the water are considered dangerous if their clearance is
less than own ship safety height. When an object currently not in the list of
dangerous objects intersects own ship's safety region, the object is added
to the dangerous objects list, which defines dangerous objects as either
`Chart Dangers' or `Chart Cautions’, see Chart Dangers. The display of
ownship’s safety region is controlled from the
Local Display
area of the
Chart Dangers menu.
In addition to the display of a safety region, an ECDIS display also enables
a
Safety Contour
and
NAV Hazards
area to be highlighted for ownship.
For information on these features refer to Chart Dangers.
The safety depth and height for each object are checked against the default
depth, height and contour settings in the Chart Depths/Heights window, see
Chart Depths/Heights
The proximity of dangers to own ship is indicated by the safety
check icon at the top right of the upper toolbar. When there are no
dangerous objects in the Dangers list the background colour of
the icon is shown in the system colour; when one or more items are added
to the Dangers list the icon colour changes to red (for Chart Dangers) or
yellow (for Chart Cautions).
In addition to the safety check icon, when items are added to the Dangers
list the Alarms button shows the message
Chart Dangers
on a red flashing
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