GPSTest displays real-time information for satellites in view of your device. A vital open-source testing tool for platform engineers developers and power users GPSTest can also assist in understanding why your GPS/GNSS is or isn't working.

Supports dual-frequency* GNSS for:
• GPS (USA Navstar) (L1 L2 L3 L4 L5)
• Galileo (European Union) (E1 E5 E5a E5b E6)
• GLONASS (Russia) (L1 L2 L3 L5)
• QZSS (Japan) (L1 L2 L5 L6)
• BeiDou/COMPASS (China) (B1 B1-2 B2 B2a B3)
• IRNSS (India) (L5 S)
• Various satellite-based augmentation systems SBAS (e.g. GAGAN Anik F1 Galaxy 15 Inmarsat 3-F2 Inmarsat 4-F3 SES-5) (L1 L5)

*Dual-frequency GNSS requires device hardware support and Android 8.0 Oreo or higher. More at https://medium.com/@sjbarbeau/dual-frequency-gnss-on-android-devices-152b8826e1c.

The "Accuracy" feature lets you measure the error in your device's position against your *actual* location (entered by you). Other apps show you the *estimated* accuracy which is generated by your device. GPSTest lets you to compare this estimated accuracy to *actual* accuracy!

Menu options:
• Inject Time Data - Injects Time assistance data for GPS into the platform using information from a Network Time Protocol (NTP) server
• Inject PSDS Data - Injects Predicted Satellite Data Service (PSDS) assistance data for GNSS into the platform using information from a PSDS server. Note that some devices don't use PSDS for assistance data - if this is your device you'll see a message saying "Platform does not support injecting PSDS data". PSDS is the generic term for products like [XTRA assistance data](http://goo.gl/3RjWX).
• Clear Assist Data - Clears all assistance data used for GNSS including NTP and XTRA data (Note: if you select this option to fix broken GNSS on your device for GPS to work again you may need to ‘Inject Time’ and ‘Inject PSDS’ data. You may also see a large delay until your device acquires a fix again so please use this feature with caution.)
• Settings - Switch between light and dark themes change map tile type auto-start GPS on startup minimum time and distance between GPS updates keep screen on.

Beta versions:
https://play.google.com/apps/testing/com.android.gpstest

Open-source on Github:
https://github.com/barbeau/gpstest

FAQ:
https://github.com/barbeau/gpstest/wiki/Frequently-Asked-Questions-(FAQ)

GPSTest discussion forum:
https://groups.google.com/forum/#!forum/gpstest_android

Nostalgic for old releases? Don't have Google Play Services on your device? Download old versions here:
https://github.com/barbeau/gpstest/releases

If you want to see the map on the Map tab you'll need to install Google Play Services.

Also available on F-Droid:
https://f-droid.org/packages/com.android.gpstest.osmdroid/