Echolocation next upgrade could highlight other players.
I often head into the mine and forest with friends and often due to our stupidity or circumstances, we get separated. Echolocation perhaps could highlight players within its range of activation, like a 2 or 3 seconds of light silhouette enough so we can regroup
Another use it can do is for rescuing lost players, either they have broken all their teleportation drink and need looking for, or waiting for a friend with backup since they have died and the one remains to hold all the backpack.
If its possible echolocation can even be upgraded to look for enemies, so we can see where they hiding or the size of their group