Base map is a very simplified map in which roads have very low accuracy, that's why it is so different from the gmapsuppHello,BC reads the gmapsupp from the gps Unit (Oregon600).BC shows not only the gmapsupp, the BaseMap from the Oregon is shown too.There is a picture at this mail.In this example the "B9" ist not at the same place. Why?Hope, you understand what i mean, my english ist not very good :))