I don’t remember where I read it, but I was under the impression that each player has a Pokemon-Go-esque “incense” aura as we move that’s unique to us, to prompt us to be active and outdoors.
As I understand it the map at large is static and what appears at a distance for one device will appear to all devices running the game at the same time. The dinosaurs that spawn on top of you, on the other hand, are unique to you, and will also disappear after you leave short range. If you walk with someone you are bound to both eventually encounter different spawns; hopefully it doesn’t bring about resentment if one of you finds epics disproportionately more frequently.
Someone who knows for sure please confirm or correct me.