Back in the early 90's, Metricom used a feature of Xerox PARC's Map Viewer to overlay the locations of their pole top boxes on an interactive map, so you could see the coverage of their Ricochet spread spectrum radio network.

https://en.wikipedia.org/wiki/Ricochet_(Internet_service)

https://en.wikipedia.org/wiki/Xerox_PARC_Map_Viewer