Sperry Marine VISIONMASTER FT ECDIS-E, User Manual

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ECDIS-E User Guide Charts
65934012 4-35
If the safety height is set at a value less than the configured value of own
ship's height a
Safety Height Low Caution is displayed.
Shallow and Deep Shading
The Deep Contour and Shallow Contour areas are highlighted on the Chart
display by colour shading, with the shallow water areas indicated by lighter
shades. 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.
WARNING:
THE CHART SHADING BASED ON THE DEFINED CONTOURS MAY
NOT ALWAYS BE ACCURATE DUE TO THE GEOMETRY OF THE
DEPTH CONTOURS IN THE AREA, AS WELL AS LIMITATIONS IN THE
SYSTEM CHART DATA AT ANY GIVEN TIME. THESE LIMITATIONS
MAY INCLUDE NON-AVAILABILITY OF USER-SPECIFIED DEPTH
CONTOURS, VARIANCES BETWEEN DATA CONTENT ON
OVERLAPPING CHART CELLS, AND OTHER DATA ISSUES. THE
OPERATOR MUST TAKE THESE FACTORS INTO ACCOUNT AND USE
ALL AVAILABLE SOURCES OF INFORMATION REGARDING DEPTH,
AS APPROPRIATE TO THE NAVIGATION AREA.
For an illustration of deep and shallow contour areas on a chart display,
refer to Legend Detail.
The default value for shallow contour is 2 metres (maximum value = Safety
Depth).
The default value for deep contour is 30 metres (minimum value = Safety
Depth).
When own ship's safety depth is changed the deep/shallow contour colours
may change although the contour outlines will remain on the chart display.
Changing Chart Depth/Height Values
To change the default values click in the required field and move the
trackball left to decrease the value or right to increase. Click the left key
again to set the value.
The contour and depth values set for the selected chart are also shown in
the Legend Detail sub menu.