level is defined as the maximum diagonal distance in nautical miles (nm) that the dis-
played chart must have on the screen before the object will be displayed.
Enter the level at which the mark will appear on the chart. The current chart dia-
gonal distance is shown in the adjacent field.
Object
When using marks, each object is defined using its object code, a unique code
that describes what the object is irrespective of its visual appearance. Although
you do not have to adhere to this, using the correct object codes allows you to
interrogate the object in use.
Select a description for the object from the pull down list.
Overlays are stored in a standard GXF format, here every object can be given a
code to describes what the object is, irrespective of the symbol or colors used.
For further information see the GXF format specification document, the latest
documentation is available from the Euronav web site.
Symbols
Different shapes can be associated with each object from a large range of pr-
defined symbols.
To select one of the 255 symbols, either select the symbol number using the
spin control or press the list button to view and select the symbols graphically.
The color of the symbol is selected from the color buttons to the right.
Select any required light blip color (light symbol).
Up to two tops mark can also be selected, these have the same color as the symbol.
Each mark can have associated a text file as well as an image file (picture)
To select an attached file select the Attached files button . Select the required
files, use the list buttons to select the required files and the view button to viiew
the files.
Most common picture formats are supported including PCX,JPEG, TIFF and BMP.
You can easily build up a visual database of for example approaches to har-
bors . The attached files can be viewed when clicking on the object using the
information inquiry (right mouse button while over the chart).
Text
Enter any required text ( Hint for a text only entry, don't select any symbols).
Select the required text size and color. The starting position for the text relative
to the symbol can be selected using the compass arrows.
Note: Any characters using the {ESCxxxx} type construct that appear are simple
rich text commands. These are explained in the GXF specifications.
Preview Window
This shows how the symbol and text will look on the final overlay.
Move or Edit mark - Move the cursor over the required mark, press the
left mouse button, a dialogue box as per adding a mark will appear edit
the information as required.
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