World Walking's Android app uses GPS. The app requires GPS to get a location which is accurate to within 500 metres. This basically tells your phone that the app wants proper GPS location data rather than location data it can surmise from WIFI and phone tower signals.
First of all you should enable your phone to receive location data. The way to do this does depend slightly on your device - but if you go to device Settings look for an option called "Location" or "GPS". Select that option, then you’ll be presented with a screen allowing you to turn it on. Select the highest accuracy if it gives you a choice.
Once you have done that you are ready to start recording the distance you walk using our app.
Click the circle with the cross in it at the foot of the screen then click on the compass symbol on the right of the next screen that appears. You'll then see a map showing your location and a blue start button. Click the start button and off you go.
As you walk, if you look at the app you’ll see a line showing the route you’ve walked so far.
Click finish when you’re done, and the app will add the steps you’ve taken to your bank. You can then be spent on any of the walks you’re currently doing.