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i do not know how this is regulated in US but here in EU using a phone is strictly forbidden during the drive. So hand-free sets for using cell phones in a car are popular. Now I can come to your question ... by analogy to safe telephone use in a car having a gps unit on the knees or between the legs is a safe use of gps (i.e., hand-free) in a car :).
ok, this time let me be the one who gives data; i purchased TopoActive Europe v4 map and downloaded it onto SD 32 GB card with City navigator Europe 2018.20 on it. There is 3 maps now on the SD card because Topo map consists of 2 maps (west and east europe). There is 9.32 MB of used space on the card and 1822 segments (565 for city navigator, the rest for topo map). Best regards.