Basic Operation of Radar
Radar/Chart Radar User Guide
3-46
65900010
Safety Checking
The safety checking facility provides the
operator with advanced warning that own
ship may be headed towards objects that
could endanger the safety of own ship,
as indicated in the ENC
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or mariner
object database.
The system periodically searches the
chart database and mariner objects
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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 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 screen. 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 Alerts button shows the message
Chart Dangers
on a red flashing
background colour (see Alert Status Indicator) if the items are defined as
dangers. If the Dangers list defines the items only as cautions the Alert
Status Indicator will not raise an alert unless the
Alerts On Cautions
check
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Electronic Nautical Chart. Chart data conforming to specification published in IHO Special
Publication No. 57 (S57). Charts complying with this specification are available from various
suppliers.
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Mariner object s are selected from a list of pre-defined object types (point, line and/or area)
which have data assigned to them, such as category, type, description and position.
Mariner objects are then saved and retrieved from a database and can be displayed on the
chart, assigned to a chart layer or exported to an external system. For details refer to Chapter
12 `Charts’, Manual Chart Update
Summary of Contents for VisionMaster FT
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