Multi-source early warning and shelter navigation for Poland
Monitor airborne signals by fusing ADS-B flight traces, official RCB alerts and media reports into voivodeship threat scores with audible lock-screen alarms. Strażnik, created by Piotr Kukier (Cukierrro), runs on Android and offers a live map, a GROTA shelter directory and a 12-hour event history. The app targets residents and visitors in Poland who want extra situational awareness where sirens may not be heard, especially at night or behind closed windows.
How Strażnik combines multiple inputs into regional threat scores
Strażnik aggregates seven independent data sources, including open ADS-B flight tracking, official RCB alerts and media reports, and applies a weighted scoring threshold before raising a high-level warning. The app displays per-voivodeship scores on a live map and logs detected signals in a 12-hour scrollable history, so users can inspect the sequence of inputs that produced each regional assessment.
Does it operate without disrupting the device?
Alert delivery is designed for reliability on locked devices. The app can trigger audible and full-screen siren alerts that bypass the lock screen to notify users when the device is closed. GROTA shelter data is cached for offline routing, while live updates require an active internet connection; the developer states location permissions are optional and coordinates are not sent off-device.
Is Strażnik safe to run on a daily device?
Privacy and source transparency are built into the project. The app has no user accounts, no third-party analytics and the source is available on GitHub, which lets technically minded users inspect data handling. Because Strażnik is unofficial and intended to supplement official channels, it does not replace RCB alerts or civil defence sirens and uses public data rather than classified feeds.
Who should install it and how technical is setup?
The app targets non-expert residents and visitors in Poland: installation is the standard Android flow from Google Play or APK, and basic operation requires no specialised knowledge. The GROTA module links to over 85,000 State Fire Service shelter locations, and the interface focuses on region selection, map inspection, and enabling lock-screen alerts rather than exposing low-level configuration options.
Practical supplementary warning for people in Poland, with an online dependency
Strażnik is a practical early-warning option for residents and visitors who want modest additional lead time before official sirens, pairing multi-source detection with offline shelter routing. Its trade-off is dependence on live internet feeds for threat scoring, which reduces the app's reach when connectivity is absent. Use it as a secondary channel alongside official alerts and local civil defence measures.
