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cGPSmapper Manual Creating custom type file
http://cgpsmapper.com/ 55 of 100
In this screen capture from a Garmin nüvi, four polygon types are shown. The one on the
left is a custom definition (described below), and the following three are standard type
0x4F, 0x50 and 0x51. The black boxes show 32x32 tiles. Notice that the leftmost tile uses
two colors, while the next three tiles use transparency. When defining a polygon bitmap,
transparency may be used in either the foreground or background color position.
You may define 2 colors, which will be used for both day and night rendering, or 4 colors
with colors 3 and 4 used for nighttime rendering.