I tied the https://mymaps.google.com/ service mentioned on https://meshtastic.org/docs/configuration/module/range-test/ but it either didn't understand the latitude/longitude columns or my CSV is jacked up. I'll take a look at that when I am on a desktop.

We seriously need to add a non-google option to the documentation here

I know osmand and organic maps on mobile allow importing .gpx (yes with x) files I'm not sure about .csv but try it