This is a map GUI widget for Racket. It can display a map based on Open Street Map tiles and it can overlay GPS tracks and locations on top of the map. The map can be panned and zoomed with the mouse.
For an overview, see https://alex-hhh.github.io/2018/06/a-racket-gui-widget-to-display-maps-based-on-openstreetmap-tiles.html