Charts
ECDIS User Guide
4-4
65900012
About Charts
Chart Types
The VisionMaster ECDIS has the capability of displaying charts in a
number of formats on all presentation windows.
Chart types are divided into two basic categories:
1. Vector charts: vector chart data is stored in a chart database. The
chart is drawn on screen based on processing of the various stored
data elements. Vector chart databases include SevenCs (S-57, S-63,
VPF) and C-Map.
2. Raster charts: the chart shows a scanned version of a traditional
paper chart, with the chart images stored as graphic files. Raster
chart types include ARCS charts, which are supported by the
SevenCs chart engine.
Safety checking does not occur when using raster charts, see
Using Raster Charts.
For a detailed description of the chart databases available from the
SevenCs and C-MAP chart engines refer to `Chart Databases’.
When S57 charts are installed, the ENC data undergoes a conversion
process. The result of this conversion is the creation of the System
Electronic Nautical Chart (SENC) database. It is this database that is
accessed and displayed by ECDIS.
Chart installation requires shutting down all navigation functions and
therefore should NOT be done when the vessel is sailing. The chart
installation process is described in the Supplementary Features User
Guide, 65900014, Chapter 1, `Chart Installation'.
Chart Rendering
The rendering of Chart data adheres to the z-order
guidelines, allowing
for radar video to be inserted in the proper z-order such that `suppressed'
chart objects appear below the radar video, and `over radar' chart objects
appear above the radar video.
16
The term `Z-order' refers to the order of objects along the Z-axis. In coordinate geometry, X
typically refers to the horizontal axis (left to right), Y to the vertical axis (up and down), and Z
to the axis perpendicular to the other two (forward or backward). One can think of the windows
in a display as a series of planes parallel to the surface of the monitor. The windows are
therefore stacked along the Z-axis, and the Z-order information thus specifies the front-to-back
ordering of the windows on the screen.
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