Master Radio Navigation for your ATPL theory exam
Free practice questions covering VOR, DME, ILS, NDB/ADF, GNSS, RNAV, RNP and radar principles — with detailed explanations covering frequencies, error types, system limitations and PBN requirements for every answer.
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Topics covered in this question bank
All major Radio Navigation topic areas from the EASA ATPL syllabus, from ground-based VOR and ILS through to modern satellite-based GNSS and PBN operations.
Operating frequencies and characteristics of main navigation aids
Knowing the frequency band of each navigation aid explains its propagation characteristics and limitations. VHF/UHF systems are line-of-sight; LF/MF systems follow ground waves and sky waves — which is why NDB is affected by night effect and thunderstorms while VOR is not.
| Nav Aid | Frequency Band | Range | Key Limitation |
|---|---|---|---|
| NDB | LF/MF (190–1750 kHz) | Up to ~200 nm | Night effect, thunderstorm interference, coastal refraction |
| VOR | VHF (108.0–117.95 MHz) | Line-of-sight (~200 nm) | Site error, scalloping, cone of silence directly overhead |
| ILS Localiser | VHF (108.10–111.95 MHz) | ~25 nm | Terrain/structure reflections; false courses possible |
| ILS Glideslope | UHF (329.15–335.00 MHz) | ~10 nm | Sensitive to terrain; false glideslope above true path |
| DME | UHF (960–1215 MHz) | Line-of-sight (~200 nm) | Slant range (not ground distance); station saturation |
| GNSS | L-band (1176–1575 MHz) | Global | Signal masking, multipath, ionospheric delay, jamming |
| Marker Beacon | VHF (75 MHz) | Very short (fixed points) | Fixed distance only; no range flexibility |
What to expect on the real exam
Radio Navigation questions are a mix of factual recall (frequencies, ILS marker beacon modulation tones, ILS category minima) and applied understanding (how slant range error affects DME, why NDB suffers night effect while VOR does not, what RAIM does and when it fails). Modern questions increasingly focus on GNSS, RNAV and RNP specifications.
How Radio Navigation connects ground-based and satellite systems
Radio Navigation covers the full range of navigation aids from legacy ground-based systems (NDB, VOR, DME, ILS) through to modern satellite navigation (GNSS) and performance-based navigation concepts (RNAV, RNP, PBN). Understanding how each system works, what errors affect it, and what its operational limitations are is essential for instrument flying.
Questions are aligned with the EASA ATPL Radio Navigation syllabus and cover both the physics of how each system operates and the operational knowledge required to use them safely.
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