COLORREF CBCGPSmartDockingParams::m_clrToneSrc

Specifies a color of marker bitmaps which should be replaced with a custom color.

m_clrToneSrc should be specified when you need to replace a color in a custom bitmap with another color. You don't need to fill m_clrToneSrc if you're going to change the color of standard (library provided) markers.