c3nav – 38C3 indoor navigation v4.2.4
APK · 2.9 MB · version code 14040204 · Android 4.0+ · uploaded Dec 27, 2023
- Same certificate as the 2 other versions checked Details
Quick check before downloading
Answer this to unlock the download. It keeps automated downloaders away.
Compared with the latest version
The latest version is v4.5.1, uploaded Sep 19, 2025 — about 1 year after this one.
- Size: this file is 2.9 MB; the latest is 4.6 MB (1.7 MB larger).
- The latest version asks for 6 more permissions: Bluetooth, Bluetooth admin, Bluetooth scan, Nearby wifi devices, Run at startup, Internal broadcast protection (app-defined).
File information
- Version
- v4.2.4 (14040204)
- Uploaded
- Dec 27, 2023
- Size
- 2.9 MB
- Requires
- Android 4.0+ (API 14)
- CPU support
- Any (no native code)
- Screen
- Small screens and larger
- MD5
- 74d83d15a5d24e7e6d09cc49c93c7ef9
- Signing certificate (SHA-1)
- 02:9E:2F:3F:B1:79:B9:6E:DB:21:F9:4A:C6:9A:99:5E:D3:B6:18:8B
- Signed by
- CN=Raphael Michel, OU=Unknown, O=Unknown, L=Unknown, ST=Unknown, C=DE
- File name
- de-c3nav-droid-14040204-66751374-74d83d15a5d24e7e6d09cc49c93c7ef9.apk
- Package
- de.c3nav.droid
- Downloads (all versions)
- 10K+
- Age rating
- PEGI 3 · Everyone
What's new in v4.2.4
* Enabled auto verification of app links / URL intend filters, as otherwise c3nav links will not be opened in the app on devices with API level 23 and up.
* Information about 802.11mc support of access points is now added to the WiFi-scan result passed to the server.
* some small bug fixes
Permissions (6)
This version requests 6 permissions, 2 of them sensitive.
- Approximate location Sensitive android.permission.ACCESS_COARSE_LOCATION
- Precise location Sensitive android.permission.ACCESS_FINE_LOCATION
- Add home-screen shortcuts com.android.launcher.permission.INSTALL_SHORTCUT
- Change wifi state android.permission.CHANGE_WIFI_STATE
- Full network access android.permission.INTERNET
- View Wi-Fi connections android.permission.ACCESS_WIFI_STATE
Security & authenticity
Security rating: Trusted
Signing certificate
- Certificate issued to “Unknown” Not the developer's name (“c3nav”). Names in certificates can't be verified, so this alone proves nothing.
- Same certificate as the 2 other versions checked
Store checks
- Developer signature not checked yet Dec 27, 2023
- Uploaded by “appupdater” Gold tier · 117,810 followers · uploading since 2020
Scans come from the source store; the certificate comparisons are AAPKs's own, made from the files' published signatures (2 other versions compared). AAPKs doesn't scan files itself.
How to install c3nav – 38C3 indoor navigation on Android 4.0+
You'll need about 5.8 MB of free space.
- Download the APK — tap Download APK above (2.9 MB). Chrome shows “File might be harmful” for every APK file; choose Download anyway only if you trust this file.
- Open the file — tap the download notification, or open Files › Downloads and tap de-c3nav-droid-14040204-66751374-74d83d15a5d24e7e6d09cc49c93c7ef9.apk.
- Allow the install (first time only) — Android 8 and later asks for permission the first time an app opens an APK: tap Settings in the prompt, turn on Allow from this source, then go back. Manual path: Settings › Apps › Special app access › Install unknown apps (on Samsung: Settings › Apps › ⋮ › Special access). On Android 7 and older: Settings › Security › Unknown sources.
- Check the file (optional) — the MD5 of the downloaded file should be 74d83d15a5d24e7e6d09cc49c93c7ef9. If it differs, the file is damaged or was changed: delete it and download again.
- Tap Install — Android asks “Do you want to install this app?”. If Google Play Protect shows a warning, read it before you continue: the source store rated this file Trusted, but only install apps from sources you trust. If an earlier version is installed, this one only installs as an update when it is signed with the same certificate (SHA-1 shown above).
- Open c3nav – 38C3 indoor navigation — tap Open on the install screen, or find it in your app drawer.
Common install problems
- “App not installed” — a version signed with a different certificate, or a newer version, is already installed (Android doesn't allow downgrades). Uninstall it first; back up your data, because uninstalling deletes it.
- “There was a problem parsing the package” — the file is incomplete, or your Android is too old (this version needs Android 4.0+). Download it again, or pick an older version.
- Blocked by Play Protect — Play Protect checks apps from outside the Play Store. Only continue if you trust the source.