I recently add a post on how to install open streets on your Garmin devices, such as the 64s or Edge520, I haven’t tried to install on my garmin Fenix 5x as it was delivered with maps installed already
Now here’s a quick post on installing OpenTopoMap rather than open streets, these the same maps as open streets but have contour lines on them as well, Oh so useful when backpacking, which I shall be doing next year 2018. The maps are updated everyweek.
http://garmin.opentopomap.org/ is the address to download the files for your Garmin device, from the screen you can download the files that can be placed directly onto your Garmin, ‘using the Garmin icon’, (rather than the Win or PC) In my case France as I there.
Once the file has been downloaded , de-zip it and place the two files (france.img and france_contours.img) in the Garmin folder, either on the 64s or in my case on the SD card, you can see that I have the open streets maps stored here as well
Now all you have to do is when starting up the 64s, choose the map that you want to use, ‘et voilà’, a map with contour lines. I disable all the other maps that I don’t need
For info you can also download this to Basecamp, (just us the Win download option and read my previous post on how to install to Basecamp as its the same as open streets. though no real need if you have already installed Open streets as Basecamp is unable to use the contours lines as it’s really two maps rather than one, Top of the line Garmin application and unable to use maps with overlays , doh…….