We currently use the smartphone’s GPS readings for outdoor activities.
            

There are several reasons why a phone or tablet’s GPS signal may not work properly, such as a communication failure with the satellite. Other times, it could be because your Location is disabled or because you are not using the best Location method. 

GPS works best where signals can be received. It requires a direct, open view of the sky in order to communicate with satellites. 

The following can result in the lost connection of GPS signals:

• Tall buildings are blocking a direct view of the sky, or when there is not a clear view of the sky.
• A storm is causing obstructed views of the satellites.
  There are too many clouds, although this is highly unlikely.
• The GPS settings are not turned on.
• The device’s screen has been turned off.
• The device is being held in a manner that blocks the antennas. 
• The phone is set to a power-saving mode. For the best GPS signal, the device should be set to High performance or Optimized.
• The app that uses GPS (like Google Maps) is listed as a sleeping app. You’ll need to remove it from the list.