Sperry Marine VISIONMASTER FT ECDIS-E, User Manual

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Basic Operation of ECDIS-E ECDIS-E User Guide
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Scale Ratio
The ECDIS scale ratio includes two scale modes: Automatic (AUTO) and
Manual.
The system defaults to AUTO scale selection
on first use. In AUTO mode the scale ratio
button on the upper toolbar shows the letter
A after the scale.
Automatic Scale
In AUTO scale mode, the system
periodically checks the current
scale of each display area for
ownship position against the
compilation scale of the largest
chart cell. If the scales differ, the
scale ratio is automatically changed
to match the compilation scale of
the chart cell.
To view or select the current
compilation scale right click on the scale ratio button.
The drop down window shows the current scale
selection mode ticked.
1. For vector charts the manual scale ratios that may
be selected range from 1:500 to 1:8,000,000 and
include a Compilation Scale, which in AUTO Scale
will be ticked. For a description of a chart's
compilation scale, see Chart Facility.
2. For raster charts a smaller range of scale ratios
are available. The scales will be dependent on the
raster chart currently selected, see Using Raster
Charts.
AUTO scale cannot be applied if True Motion limits are
off, for example in panning or zoom mode.