Aviation Morse Code: How VOR Beacons Identify Themselves
Every VOR (VHF Omnidirectional Range) navigation beacon broadcasts a 3-letter Morse code identifier so pilots can confirm they’re tuned to the correct station before trusting its bearing.
How It Works
- Each VOR station has a unique 3-letter identifier (e.g. a beacon near Boston might use BOS).
- The identifier is transmitted in Morse at roughly 7 words per minute — slow enough to copy by ear without training.
- It repeats every 7-10 seconds, interleaved with (or instead of) a recorded voice identification on modern equipment.
- Pilots cross-check the Morse ID against their chart before relying on the VOR’s course guidance — this catches wrong-frequency tuning or equipment faults.
Try Decoding a VOR Identifier
Paste any 3-letter identifier into the TypeMorse translator to hear it exactly as it sounds over the aviation band, or use the table below for common single letters used in identifiers.
| Letter | Morse |
|---|---|
| B | -… |
| O | — |
| S | … |
Other Places Morse Still Flies
- NDBs (Non-Directional Beacons) — identify with a 2-3 letter Morse code, similar to VOR.
- ILS localizers — some transmit a 3-letter identifier ending in a fixed suffix pattern.
- Airport approach charts — list each beacon’s Morse identifier next to its frequency for pilot reference.
Want the full alphabet? See the complete Morse code alphabet chart, or head back to the Morse code translator to convert any identifier or message.
Aviation Morse Code Examples
Aviation Morse code is still broadcast every day by radio navigation beacons. Each VOR, ILS, and NDB station transmits a short identifier in Morse code, usually two or three letters, on a repeating loop. A pilot tunes the station’s frequency, listens for the identifier, and compares it with the code printed on the chart. That check confirms the aircraft is receiving the intended station and not a different one on a nearby frequency. Because the identifier is sent slowly and repeated often, pilots can copy it by ear even in a noisy cockpit.
Here are simple examples of how aviation Morse code identifiers work. A VOR with the identifier LAX would transmit dot-dash-dot-dot for L, dot-dash for A, and dash-dash-dash-dash for X, with clear gaps between letters. An NDB with the identifier AB would transmit dot-dash for A and dash-dot-dot-dot for B. An ILS localizer identifier such as I-XYZ begins with the letter I, dot-dot, followed by the runway’s letters. These identifiers are not secret messages; they are station call signs in Morse code, published on charts so any pilot can verify them. The same dot-and-dash alphabet is used in amateur radio and in the Morse code Q-codes used by operators.
Pilots use aviation Morse code as one layer of a safety check. Before trusting a navigation signal, a pilot confirms the identifier matches the chart, checks that the signal is steady, and cross-checks the reading with another source such as GPS. If the identifier is missing or wrong, the pilot treats the station as unreliable and uses another navigation source. Student pilots practice this check early in training, and it remains a required habit even with modern GPS navigation, because a wrong station can quietly lead an aircraft off course. To practice hearing identifiers, use the Morse code practice tools and the Morse code alphabet chart.
Frequently Asked Questions
What is aviation Morse code?
Aviation Morse code is the system of dot-and-dash identifiers broadcast by radio navigation beacons such as VOR, ILS, and NDB stations. Each station transmits its identifier in Morse code so pilots can confirm they are tuned to the correct station. It is the same Morse code alphabet used in amateur radio.
How do pilots use aviation Morse code?
Pilots tune a station’s frequency, listen for its Morse code identifier, and compare it with the identifier printed on their chart. A match confirms the correct station. Pilots repeat this check before trusting a navigation signal, and they treat a missing or wrong identifier as a sign that the station is unreliable. The FAA publishes guidance on radio navigation aids and identifier checks.
What is an NDB identifier in Morse code?
An NDB identifier is the two- or three-letter code a non-directional beacon transmits in Morse code on a repeating loop. Pilots listen for it to confirm they are receiving the intended beacon. NDB identifiers are published on aviation charts alongside the beacon’s frequency.
What is a VOR identifier in Morse code?
A VOR identifier is the two- or three-letter code a VHF omnidirectional range station transmits in Morse code. It lets pilots confirm they are tuned to the right VOR before using its bearing information. VOR identifiers are printed on charts next to the station’s frequency and symbol.
Do pilots still need to learn Morse code?
Pilots do not need to be fluent in Morse code, but they do need to recognize station identifiers by ear. Training covers the alphabet and identifier checks, and pilots keep the skill current by checking identifiers on every flight. The basic skill is small but safety-critical.
Is aviation Morse code the same as amateur radio Morse code?
Yes. Both use the same International Morse Code alphabet. Aviation use is narrower, because it mainly involves station identifiers, while amateur radio uses the full alphabet for conversations, contests, and emergency communication. Learning the alphabet once covers both worlds. Learn more about the code in the Morse code article on Wikipedia.
