You can't edit or create a map with mapsource.
You need the special software.
ie.
Geopainting GPSMapEdit.
CgpsMapper
Etc.
So you can create your own map and can be displayed at the same time with garmin mapset.
For the example below. Yellow line is the road from TCN V10.1 (Thailand) , and within the red line is my own map.
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