Look at the first entry: Radar at page 199 — Page 389, Lesson 385

This is the index page of the book — the table of contents for the whole Radio Navigation volume. So what I want to do here is give you the lay of the land, because this tells you exactly how the syllabus is structured and where the radar material sits. Look at the first entry: Radar at page 199. That's our chapter focus. And right around it you'll see the radar family grouped together. Area Surveillance Radar at 199, ASMR at 199, ASR at 199, Airport Surface Movement Radar at 199 and 201, and AIRFIELD SURFACE MOVEMENT INDICATOR at 201. Notice the acronyms — ASMR is Airport Surface Movement Radar, ASR is Area Surveillance Radar, and ASMI is the Airfield Surface Movement Indicator. These are the ground-based radar systems that air traffic control uses, and they're all clustered in that radar chapter. Now, the index also shows you the airborne side. Airborne Weather Radar (AWR) at 184, and Airborne Doppler at 68. AWR is the weather radar in the aircraft nose, and Doppler radar is the one that measures relative velocity using the Doppler shift. Both are listed as Air/Ground Navigational Systems at 184, alongside Air Traffic Control at 184 and Airways at 111 and 184. You'll also see the radar antennae entry — ATC Radar Antennae at 188 — and Attenuation at 19 and 189, which is the weakening of a signal as it passes through a medium. That's a fundamental radar concept you'll need. The index also cross-references the navigation aids that pair with radar. Automatic Direction Finder (ADF) at 85, Amplitude Modulation (AM) at 43 and 44, Angle of Bank (dip) at 100, Antenna at 211, Antennae at 55. And you'll see Back Azimuth at 174, Back Beam Approach at 156, Back Course — these are all approach-related terms. So the takeaway here: this index is your map. The radar chapter at 199 is where the ground surveillance systems live — ASR, ASMR, ASMI — and the AWR at 184 is the airborne weather radar. When we get into the actual radar chapter, we'll unpack each of these systems in detail. For now, just know the structure: radar splits into ground-based surveillance and airborne weather detection, and both feed into air traffic control and navigation.