This "1 Compass" app uses the built-in magnetic compass and accelerometer sensors to display directions.

It also displays:
Current Location (Lat-Long)
Current Location Accuracy
Current Altitude
Current Speed
Current Address (calculated from Lat-Long)
Satellites Visible/Used for location
Ambient Light value (Lux)
Detected Magnetic Field
Azimuth (Yaw), Pitch and Roll
Display technical details of your phone

Additional features:
Augmented Reality (AR) view (tilt the phone up)
Menu option to download GNSS logs in CSV and JSON formats
Measure short distances by walking