Every storm you pinned was at an exact spot on a GRID, found using TWO numbers: a COLUMN (right) and a ROW (up). The pair (3, 5) means 3 steps right, 5 steps up — that's a COORDINATE POINT! The corner is the ORIGIN (0, 0). Maps, GPS, video games, and every screen pixel use this system — it's called the Cartesian plane. You were plotting points like a real navigator!