Page 101 - Electronic Navigation Cyber Book

ECDIS Priority Layers
ECDIS requires data layers to establish a priority of
data displayed. The minimum number of information categories
required and their relative priority from the highest
to lowest priority, are listed below:
• ECDIS Warnings and Messages.
• Hydrographic Office Data.
• Notice to Mariners Information.
• Hydrographic Office Cautions.
• Hydrographic Office Color-Fill Area Data.
• Hydrographic Office On Demand Data.
• Radar Information.
• User’s Data.
• Manufacturer’s Data.
• User’s Color-Fill Area Data.
• Manufacturer’s Color-Fill Area Data.
IMO standards for ECDIS will require that the operator
be able to deselect the radar picture from the chart with
minimum operator action for fast “uncluttering” of the
chart presentation.

ECDIS Calculation Requirements
As a minimum, an ECDIS system must be able to perform
the following calculations:
• Geographical coordinates to display coordinates, and
display coordinates to geographical coordinates.
• Transformation from local datum to WGS-84.
• True distance and azimuth between two geographical
positions.
• Geographic position from a known position given distance and
azimuth.
• Projection calculations such as great circle and rumb line courses and
distances.

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