http://9w2svt.blogspot.com/2014/12/aprs-arduino-with-map-display.html
https://unsigned.io/forum/viewtopic.php?id=9
https://morioh.com/p/60ee1bfcd36c
https://github.com/marceloprates/prettymaps
[https://newbedev.com/leaflet-with-custom-map-crs-how-to-convert-jpg-to-tilelayer-tiles]
https://wiki.openstreetmap.org/wiki/Slippy_map_tilenames
https://gist.github.com/tonyrewin/9444410
2022-01-17 20:02:50
Leaflet draw plugin demo https://leaflet.github.io/Leaflet.draw/docs/examples/full.html
Documentation https://leaflet.github.io/Leaflet.draw/docs/leaflet-draw-latest.html