* Version 3 uses detail Topo 10m topographic data made by Japan GSI
Contour line map included in our map is generated from the 2 arc second (50 meter) mesh of the height points(DEM) on Digital Map 25000 (Spatial Data Framework). Although we use quite decent algorithm of generating contour lines, it is not a real trace of topographic map. Therefore, we cannot guarantee the accuracy of the contour line. We do expect there may be incorrect as well as non-real lines. Please understand this limitation when you use.