Can't you just make an OSM file from the location and use https://banglejs.com/apps/?id=openstmap?
@Hank started
Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
Can't you just make an OSM file from the location and use https://banglejs.com/apps/?id=openstmap?