Bug: Basecamp will overwrite an existing gmapsupp.img file without any warning. I have two maps installed in Basecamp: velomap-europe and velomap-australia-oceania. I place the SD card from my Garmin in an SD reader connected to the PC, select Install Maps from the Maps menu, select the map to install from and the tiles I want, and let Basecamp install the map to the SD card. It creates a gmapsupp.img file in the Garmin folder on the SD card. I then repeat the install process for the other map, and Basecamp overwrites the gmapsupp.img created from the first map with gmapsupp.img from the second map without giving any warning that the existing file is being overwritten. If I don't want the first gmapsupp to be overwritten by the second, I have to use a file manager to rename it before running the second map install.
Problem: If I want to install the entire Europe map, Basecamp won't install to the SD card in the reader as the selected tiles exceed 4Gb in size. However, if I place the SD card in the GPS (an Edge 1000), and connect the GPS to the PC via a USB cable, then I can install the entire Europe map as Basecamp handles the splitting of the map into multiple img files each <4Gb in size. The problem with installing to the SD card when it is in the GPS is that the write speed is about 30x slower than if the SD card is in a reader. With the SD card in the GPS I get a write speed of ~300Kb/s, with it in the SD reader I get ~11Mb/s write speed. I guess the slow write speed to the GPS is due to Garmin still being in the dark ages as regards USB, and they still only have USB 1.1 support in their devices, which has a max write speed of 12Mbit/s (~1.4Mb/s). Seeing that USB2 with a max write speed of 480Mbit/s has been around since 2000 and USB3 with a max write speed of 5Gbits/s siince 2008, this is pretty inexcusable.
