A free app for Android, by barbeauDev.

GPSTest is a free, open-source app for testing your Android device’s GPS and Network services. It is designed to be a simple way for you to get information about the quality of the location you’re getting from your device. It does this by displaying real-time information for the satellites in view of your device.

It is a vital open-source testing tool for platform engineers, developers, and power users. It can also assist in understanding why your GPS/GNSS isn’t working.

You can see the current accuracy, and compare it to the accuracy you got the last time you used it.