We're at the very front of the book — the index — Page 393, Lesson 402

We're at the very front of the book — the index. I know it looks like just a list of page numbers, but I want to use it as a map. It tells us exactly what this radio navigation syllabus is going to demand of you, and it introduces the vocabulary you'll be tested on. So let's walk through it, and I'll flag the terms that are going to matter most. First, under "P," we have Pseudo-random Noise at page 308. That's a satellite navigation concept — a signal pattern that looks random but is actually generated by a known algorithm. It's how a GPS receiver identifies which satellite it's listening to. Then Pseudo-range, pages 314 and 315. That's the measured distance from a satellite to the receiver, based on signal travel time — "pseudo" because it includes clock errors that have to be corrected. Pulse Length, page 185 — the duration of a single radar pulse. Pulse Modulation, pages 43 and 47 — how information is impressed onto a pulse train. Pulse Recurrence Frequency (PRF), page 185 — how many pulses are transmitted per second. And Pulse Recurrence Interval (PRI), also page 185 — the time between the start of one pulse and the start of the next; it's the reciprocal of PRF. Pulses at 183, and Pulse Technique at 185 and 247 — that's the whole family of pulsed radar and DME ranging. Pythagoras, page 211 — that's the geometry behind radar beam calculations, right-angle triangles. PZ90, page 306 — that's the Russian GLONASS coordinate reference frame. Under "Q," we have the Q-Code at page 75 — the three-letter shorthand used in aviation communications. QDM at 76 and 121 — magnetic bearing to the station. QDR at 76, 113, and 121 — magnetic bearing from the station. QTE at 76 — true bearing from the station. And QUJ at 76 — true bearing to the station. These are the four classic direction codes you'll use in VDF and NDB work. Quadrantal Error, page 100 — that's the bearing error in an ADF caused by the aircraft's metal structure bending the received signal. Under "R," we start with Radar at 183, Radar Aerials at 60, Radar Beam at 211, Radar Frequencies at 185, Radar Resolution at 191 — the ability to distinguish two close targets — and Radar Shadow at 218, where terrain blocks the beam. Radial at 113 and 124 — a magnetic bearing from a VOR station. Radial Interceptions at 129 — how you fly to capture and track a specific radial. Radio at page 5 — the foundation of the whole subject. Radio Magnetic Indicator at 90 and 122 — the RMI, the instrument that combines a compass card with an ADF or VOR bearing pointer. Range Error at 321 — the error in a satellite range measurement. Range Search at 247 and 249 — a DME technique for finding the correct pulse pair. Rate of Descent at 162 — vertical speed, used in approach planning. And the last entry we can see is RBI — that's the Relative Bearing Indicator, the ADF display that shows the bearing of the station relative to the aircraft's nose. Now, here's the thing I want you to take away. Look at the pattern: pulsed systems, Q-codes, radar, VOR radials, and satellite ranging. That's the skeleton of this entire syllabus. When we get to each chapter, you'll already recognize the names. So this index isn't just page numbers — it's your first exposure to the professional vocabulary.