8. Vector Chart Material
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8.9.4 How to control visible chart features
The Chart Display dialog box contains several pages of chart features that you may adjust as appropriate. To display
this dialog box, spin the scrollwheel to show Chart Display/Info/Standard Display in the mouse functions area then
push the left mouse button.
How to set value for Shallow Contour, Safety Contour and Deep Contour
You can set values for Shallow Contour, Safety Contour and Deep Contour. This can be done on the Chart page of
the Chart Display dialog box. Colors used for depth presentation are controlled by the setting values for Shallow
Contour, Safety Contour and Deep Contour. See the illustrations below for multi-color and two-color presentations.
Selection of multi- and two-color presentation can be done by selecting from the list box of "Depths" on the Chart
page.
Multi-color presentation
Chart zero
Shallow contour
Safety contour (input value)
Safety contour (exisiting in ENC)
Deep contour
Non-navigable area
Navigable area
In the multi-color presentation, four colors are used for depths. If the input Safety contour does not exist in the
electronic chart, the system automatically selects the next deeper available depth contour as the safety contour. For
example, the input value is 8 m, but there is no 8 m depth contour in the electronic chart. Then, the system selects
the next deeper depth contour (10 m) as the safety contour. The depth contour value of 10 m is presented as the
safety contour in this electronic chart.
The shallow contour is for possible visual color change inside the unsafe water area. The unsafe water areas are all
shallower than the safety contours. Set the value for the shallow contour less than the value of the safety contour.
For more information about color change, see the description on the next page.
Two-color presentation
Non-navigable area
Chart zero
Shallow contour
Safety contour (input value)
Deep contour
Safety contour (exisiting in ENC)
Navigable area
In the two-color presentation unsafe water is shown in blue and safe water is shown in white.
If the safety contour does not exist in the electronic chart, the system automatically selects the next deeper available
depth contour as the safety contour. For example, the input value is 8 m, but there is no 8 m depth contour in the
electronic chart. Then, the system selects the next deeper depth contour (10 m) as the safety contour. The depth
contour value of 10 m is presented as the safety contour in this electronic chart.
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