Best geolocating tool for use with phaser?

Hello,

I intend on building some real-time geolocating/geohash logic into my game, ie: if I am within 10 meters of a landmark, generate a sprite on a map… Sort of the same concept as a gym in Pokemon Go for example, but without the need for camera AR, just the map portion…

Does anyone have any experience with incorporating something like that into a phaser game or know the best tool to use?

Thanks