Summary
- Researchers have demonstrated that faint aircraft sounds embedded in recordings can be used to determine where and roughly when a video was made.
- The method cross-references Doppler frequency curves from passing aircraft with publicly available ADS-B flight-tracking data.
- ADS-B data — covering aircraft position, velocity, and altitude — is freely accessible through commercial flight-tracking services.
- This has direct implications for operational security: recordings made in sensitive environments may inadvertently disclose location.
- No technical countermeasure is cited in the source material; awareness and audio hygiene practices are the primary controls available.
The technique in brief
A technique documented by researcher Colsto shows that the geographic origin of a video can be determined without any visual cues, using only the audio track. The method analyses the Doppler curves embedded in background noise — specifically, the characteristic frequency shift produced as an aircraft approaches and then passes an observer. That shift follows a predictable mathematical pattern, and it is distinct enough to be extracted even when the aircraft sound is faint relative to other ambient noise.
Open data makes it scalable
What elevates this from academic curiosity to operational concern is its reliance on freely available information. Aircraft equipped with Automatic Dependent Surveillance–Broadcast (ADS-B) continuously transmit their position, velocity, and altitude. Flight-tracking services aggregate this data and make it publicly accessible. By matching the Doppler signature extracted from a recording against the flight paths known to have been active at the time, an analyst can narrow the recording location to a surprisingly small area. The source material notes that not every aircraft is tracked under ADS-B, but the coverage is described as providing an enormous amount of information about aircraft movements.
The overlap of passive signals and open-source intelligence
This technique sits at the intersection of two trends that security teams should already be watching: the increasing analytical power of open-source intelligence (OSINT) methods, and the growing sensitivity of seemingly innocuous environmental data. The aircraft sounds in a recording are not secret — they are a natural artefact of the recording environment. The flight data used to interpret them is published openly. Neither input is classified or protected. The analytical step that combines them, however, produces information that the person who made the recording almost certainly did not intend to disclose.
What kinds of recordings are at risk
Any audio or video recording made near a flight path — which, in practice, means most populated areas — could carry this signal. That includes internal communications recorded for reference, leaked documents with accompanying audio, incident response call recordings shared externally, executive communications, and media produced by staff in the field. The technique does not require the recording to be made outdoors; aircraft sounds can penetrate building envelopes, particularly at lower altitudes or in locations near airports and common flight corridors.
Limitations acknowledged
The source material does not quantify the precision of location estimates produced by this method, nor does it specify how much audio is needed for a reliable result. It also notes that ADS-B coverage is not universal. These are meaningful constraints, but they do not eliminate the risk — they define its boundaries. A sophisticated analyst with sufficient flight-path data and a clear Doppler signature has a credible path to geolocation.
Why it matters
For CISOs, the significance is not the technique itself but what it represents: a class of metadata leak that most organisations have no controls for and are not monitoring. Audio recordings are routinely excluded from data classification schemes that focus on text and images. If a recording made inside a sensitive facility — a data centre, a secure operations floor, an executive briefing room — is ever disclosed, even partially, an adversary with moderate OSINT capability may be able to determine where it was made. That could confirm the location of infrastructure, the geography of a team, or the physical environment of a person under threat. Threat actors conducting reconnaissance against an organisation’s physical security posture, or nation-state actors attempting to geolocate individuals, now have a credible and low-cost tool to add to their workflow.
What to do now
- Treat audio recordings as location-bearing artefacts in your data classification policy, particularly for recordings made in or near sensitive facilities.
- Remind staff that background sounds in video and audio communications may carry environmental metadata, and consider guidance on recording environments for sensitive calls.
- When reviewing any leaked or unattributed recording relevant to your organisation, consider that geolocation via audio analysis may already be possible for a motivated adversary.
- If your threat model includes physical security or personnel protection, brief your security team on the existence of audio-based geolocation as an OSINT technique.
