We start with "Glide Slope Deviation" at page 291 — Page 657, Lesson 772

This is the index of the book — the alphabetical listing of topics with their page numbers. So what I want to walk you through is how to read this index, because it's a map of the entire syllabus, and it tells you exactly where every subject lives in the book. Let's look at the entries we have here. We start with "Glide Slope Deviation" at page 291. That's the vertical guidance signal in an ILS — the instrument that tells you whether you're above or below the correct descent path. Then "Global Air Traffic Management System" at 319 — that's the overarching framework for how air traffic is managed worldwide. "Global Communications" at 317 — that's the communication infrastructure that supports that system. Then we have "GNSS" at 325 — that's the Global Navigation Satellite System, the umbrella term for satellite-based navigation. "Go-around" at 16 — that's the missed approach procedure, when you abort the landing and climb away. "Go-around Mode" at 395 — that's the autopilot or autothrottle mode that commands that go-around maneuver. "GPS" at 271 — that's the Global Positioning System, the American satellite navigation system. "GPWS" at pages 263, 266, 311, and 449 — that's the Ground Proximity Warning System, the terrain warning system. And you'll notice it's listed twice — once as "GPWS" and once fully spelled out as "Ground Proximity Warning System (GPWS)" at 263, 266, 311, and 447. That's a common index convention — the acronym and the full name both get entries, pointing to the same pages. Then "Gravity" at 257, and "Gravity Effects" at 232 — those relate to how gravity affects the instruments, particularly accelerometers. "Green Arc" at 45 — that's the green arc on an airspeed indicator showing the normal operating speed range. Now we get into the gyro section. "Gyro Compassed" at 240 — note that's a typo in the index, it should be "Gyro Compass" — and "Gyro Compassing" at 237 — that's the process of aligning a gyro compass. "Gyro Horizon" at 178 — that's the artificial horizon, the attitude indicator. "Gyro-magnetic Compass" at 211 — that's a compass that combines a gyroscope with a magnetic sensor. "Gyroscopes" at 137 — that's the fundamental instrument, the spinning wheel that maintains orientation. "Gyroscopic Inertia" at 138 — that's the property of a gyroscope that resists changes to its axis of rotation. And "Gyro Stabilized Platform INS" at 256 — that's the Inertial Navigation System that uses a gyro-stabilized platform. Then "Hard Iron" at 109, and "Hard Iron Magnetism" at 202 — that's the permanent magnetism in the aircraft's structure that affects the compass. "Hardware" at 308 — that's the physical components of a system, as opposed to software. "Heading 'bug'" at 291 — that's the movable marker on the heading indicator that you set to your desired heading. "Heading & Drift" at 243 — that's the display showing your heading and the drift angle. "Heading Indicator" at 211 and 218 — that's the directional gyro, the instrument that shows your heading. "Heading Mode" at 345 — that's the autopilot mode that holds a selected heading. "Heading Select" at 368 — that's the function that lets you choose a heading. "Heading Select Marker" at 219 — that's the bug on the heading indicator. And "Heading Selector Control" — that's the knob you turn to set the desired heading. So the key thing to understand here is that this index is organized alphabetically, and each entry gives you the page number or numbers where that topic is discussed. When you see multiple page numbers, like with GPWS, that means the topic appears in several places throughout the book. When you see an acronym and a full name both listed, they point to the same content. And when you see a typo like "Gyro Compassed," you just recognize it for what it is and move on. This is your reference tool. When you're studying, you use this to jump straight to a topic. When you're revising, you use this to check that you've covered everything. It's the backbone of your study plan.