Non-Directional Beacons
E586555
Non-directional beacons are ground-based radio transmitters that emit signals in all directions to help aircraft determine their bearing and navigate, especially in low-visibility conditions.
Observed surface forms (2)
| Surface form | Occurrences |
|---|---|
| Non-Directional Beacon | 0 |
| NDB LLS | 1 |
Statements (48)
| Predicate | Object |
|---|---|
| instanceOf |
aeronautical radio navigation service
ⓘ
ground-based navigation aid ⓘ radio navigation aid ⓘ |
| abbreviation | NDB ⓘ |
| beingReplacedBy |
area navigation procedures
ⓘ
satellite navigation systems ⓘ |
| canBeLocatedAt |
near airways
ⓘ
off-airport remote site ⓘ on an airport ⓘ |
| category | aviation navigation infrastructure ⓘ |
| comparedWith | VHF Omnidirectional Range NERFINISHED ⓘ |
| coverageType | line-of-sight limited by ground-wave propagation ⓘ |
| emits | radio signal in all directions ⓘ |
| frequencyBand |
low frequency band
ⓘ
medium frequency band ⓘ |
| hasLimitation |
less accurate than VOR
ⓘ
susceptible to atmospheric interference ⓘ susceptible to coastal refraction ⓘ susceptible to night effect ⓘ |
| hasVariant |
locator middle marker
ⓘ
locator outer marker ⓘ |
| introducedIn | early 20th century ⓘ |
| modulation | amplitude modulation ⓘ |
| navigationPrinciple | bearing determined by relative bearing to station ⓘ |
| operatesIn |
instrument meteorological conditions
ⓘ
low-visibility conditions ⓘ |
| powerLevel |
higher-power for en‑route NDB
ⓘ
low-power for terminal NDB ⓘ |
| receivedBy |
ADF receiver in aircraft
ⓘ
automatic direction finder ⓘ |
| regulatedBy |
Federal Aviation Administration
NERFINISHED
ⓘ
International Civil Aviation Organization NERFINISHED ⓘ |
| relatedTo | instrument landing system ⓘ |
| requires | magnetic compass for bearing calculation ⓘ |
| signalType | continuous wave ⓘ |
| stillUsedIn | many regions worldwide ⓘ |
| supportsInstrumentProcedure |
NDB approach
ⓘ
NDB holding pattern ⓘ |
| transmits | Morse code station identifier ⓘ |
| typicalFrequencyRange | 190–535 kHz ⓘ |
| usedBy |
aircraft
ⓘ
pilots ⓘ |
| usedFor |
aircraft navigation
ⓘ
approach procedures ⓘ bearing determination ⓘ en‑route navigation ⓘ holding patterns ⓘ |
| uses | non-directional radio transmission ⓘ |
Referenced by (2)
Full triples — surface form annotated when it differs from this entity's canonical label.
this entity surface form:
NDB LLS