How do I create device interaction on a geo grid? Craig Conover February 16, 2021 07:49 Updated Geohashing Chat by User Proximity Tutorial is the best place to start to learn more about Geo Grid Device Interactivity. Related articles How do I authenticate subscribers? Can I use PubNub to track moving objects? How do I enable the Presence feature? How do I add notifications to a chat room app? What is Access Manager v3?