Nav AIDs. . . . . . . . . . . . . . . . . . . . . . . . . . . 286 — Page 659, Lesson 783

This is the index page of the book — the alphabetical listing of topics. So what I want to walk you through is how to read this thing, because it's a map of the whole syllabus. Look at the entries. Each one has a topic name, then a page number. That's the page where the topic starts. Some have two numbers, like "Nav AIDs . . . 286, 293" — that means the topic appears in two places, and you'll find the main treatment at 286 and a continuation or related discussion at 293. Now, the entries here are all navigation-related, because that's the section we're heading into. Let me read them off for you. "Nav AIDs" — that's navigation aids, the radio and electronic systems that help you navigate. It starts at page 286 and continues at 293. "Navigation" — the general subject, starts at 272. "Navigation Computer" — that's the computer that processes navigation data, at page 32. Notice it's early in the book, because the computer is a fundamental component. "Navigation Data" — the actual information the computer uses, at 273. "Navigation Displays" — the screens that show you the navigation picture, at 281 and 295. "Navigation Modes" — the different ways the system can operate, at 345. "Nav Mode" — that's a specific autopilot mode, at 240. Don't confuse it with "Navigation Modes" — Nav Mode is the autopilot function that follows the navigation system's commands. "ND" — that's the abbreviation for Navigation Display, at 281. So when you see "ND" in the book, it means the Navigation Display screen. "Newton's Laws" — the physics laws, at 228. That's in the general physics section. "No Bearing Advisories" — that's a specific condition in navigation, at 490. "Non-corrosiveness" — a material property, at 122. "Non-magnetic" — another material property, at 108. "Non-volatile Memory" — that's memory that retains data when power is removed, at 309. That's important for navigation computers — they keep their data even when the aircraft is shut down. Then under "O": "Occasions for Swinging the Compass" — that's when you need to calibrate the compass, at 205. "Oceanic Clearance" — that's the clearance you get for transoceanic flights, at 320. "Off Ground" — at 321. So the pattern here is simple: topic name, then page number. When you see two numbers, the topic spans two locations. When you see an abbreviation like "ND," the book tells you what it stands for right there in the index. Now, the key thing to understand: this index is your study tool. When you're revising, you use it to jump straight to a topic. When you're studying in order, you follow the page numbers sequentially. The page numbers are the actual page numbers in the book, not the PDF page numbers — so if you're using a digital copy, you may need to account for the offset. That's the index. It's not content to memorize — it's a reference. The real content starts when we turn to page 272 and begin with Navigation proper.