When you open Plates you begin by seeing, you guessed it, plates. Thumbnails of approach charts are there for the selecting. When you choose one, a full-screen chart pops up, and you’re good to go. Zoom in and see all the details — although, on the iPad, they’re easy to see without zooming. Lock the chart orientation with a software button on the upper-right-hand part of the screen, and you can rotate the iPad at will without the display flipping on you. You can download the entire United States or simply choose the state or region you’ll be flying in. Downloads using Wi-Fi are satisfyingly swift.