Every time a device is moved more than 500km, the GPS system needs to be re-calibrated to ensure GPS coordinates are accurate.
The calibration can be done with or without a SIM card in the phone. If the phone has a working data connection, either through Wi-Fi or using a SIM card, the calibration process takes only a few minutes. If these are not set correctly, it can take up to 30 minutes.
An easy way to check if the GPS is calibrating correctly is to use the free app ‘GPS Status & Toolbox’, which can be installed from the PlayStore. You can also install the app from your Flow space. Simply add "/gps" after your Akvo Flow url in the browser on your device and the GPS Status app will download directly to your phone.
To calibrate GPS
Take the phone outside to a location where there is a clear view of the sky. It makes no difference whether the sky is cloudy or clear.
Ensure that the GPS is turned on
Ensure that you are in an open area and NOT inside a building
Open the GPS Status app
Keep the device static and DO NOT move around with it. If possible away from reflecting surfaces such as walls
Monitor the status of the GPS data being received by the device in the GPS status app.
If you still do not get a fix after 15-20 mins, re-locate to a different spot few meters away and try again
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