Or, how about this: labeling teleportals, like we can do now with chests. That way one can also tell which teleportal is which if there's more than one on the island. I often have to make extra jumps because I can't tell a portal by its coordinates.
That's already possible - when you interact with a teleportal, the bottom right button lets you rename it. The list will be sorted alphabetically, so you can use this to both know what teleportal goes where, and to organize the list using special characters/numbers at the beginning.
