The Basemap.fbl serves the purpose to tell the navigator that it is the map and complement the passage between neighboring countries.
It is a file that has the boundaries of countries, used to view the boundaries when given a zoom to zoom out.
The Basemap.fbl if not in the Content / Map folder navigator does not complete the initial cycle and may display an error message.

Works with maps TomTom-TeleAtlas Here-Navteq Topmap


more information:
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