"Oh, those must be the towers! Link told me about them, and I heard a bit from travelers, but I haven't seen them for myself. This century, anyway. We dug up some of these back before the Calamity, but they weren't very useful then—they populate maps for you in a Sheikah Slate, but it's dependent on the visibility of the tower's scanners. Apparently they exploded out of the ground when Link came out of the Shrine of Resurrection, so now each one gives miles and miles of mapping."
She's sorting the piles of scavenged paper into stacks as they speak.
"They also have working travel gates. I'm not sure where the power's coming from! They weren't self-powering before; we had to hook up these massive furnace linkages to boot one up, and it ended up mostly a waste of time. If your drone has good dexterity, you could have given it a Slate to pick up the gates. Should have thought of that, oops!"