Oliver turns the phone over in hand, ink on the back of his hand glowing a soft blue. He hums soft under his breath, eyes half-lidded and focused down on the phone itself.

"So, usually, this is where I'd use selenite and iron to make a compass that points directly to the source of the magic. Right? Easyish, you put one piece," His hand drops down to the circle, places fingers against one corner of the triangle. "here, either the phone, or the selenite, and put the other on this point," fingers slide over, careful not to smudge lines, "Then I use myself to complete the triangle. I can do that. Or I can just use the phone's GPS and point it directly at it's source."