Charts
Radar/Chart Radar User Guide
12-4 65900010
When displaying a chart that was created using a datum other than WGS-
84, a warning displays information about the chart’s datum. The Chart
Legend window also shows the datum of the displayed chart, see Legend
Detail.
Codes used to identify various known chart data are listed in Appendix A –
Chart Datum Codes.
Compilation Scale
Chart data is compiled at a specific scale, based upon the hydrographic
data from which the chart was created. This scale is called the chart’s
compilation scale, indicating the level of detail that is available on the chart.
When charts are first selected for display, they are displayed at their
compilation scale.
A chart's compilation scale is shown in the
Detail
tab folder of the Chart
Legend menu, under Chart Usage/Scale, and Chart Index, which shows
the scale and other details of all charts in a selected chart database.
When the range scale is selected at a larger scale than the chart's
compilation scale a permanent prompt appears with the message `
Chart
Overscale'
, see Chart Overscale.
Navigational Purpose
In addition to the compilation scale, the level of detail and expected
accuracy available on a chart is also related to its navigational purpose. For
example, Harbour, Approach, Coastal or General. A chart's navigational
purpose is shown in the
Detail
tab folder of the Legend menu under Chart
Usage/Scale, and under Chart Index.
Chart Overscale
There are two ways in which the system indicates that chart data is being
displayed at a larger scale than its compilation scale: the overscale prompt
and the overscale pattern. For more details on chart prompts, see Prompts
in Chapter 7, Alerts.
Summary of Contents for VisionMaster FT
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