For teaching Coordinate Reference Systems in my GIS/cartography intro course, I made this simple app that can show the current GPS location in two different coordinate systems. It supports all CRS supported by Proj4JS (more than five thousand).

(Yes there is a ton of "coordinate converter" apps out there, but their UI is far too overloaded for my purposes.)

https://cartolab.at/coords/

Source code is available at https://github.com/floledermann/coordinates

#gis #gischat