Smart Compass is in the 3rd set of the Smart Tools collection.This compass is a tool to search bearings(azimuth) using the built-in magnetic sensors. It has 4 significant features.1. Although you may turn the phone into portrait or landscape mode, the heading is fixed.2. The Camera's view is used for reality.3. Metal Detector is included to verify the magnetic sensor.4. GPS is supported.The compass app depends on the performance of your device exactly. If the compass works perfectly, it means that your sensors are perfect, too.If it is inaccurate, please check that you aren't being affected by a magnetic field. Also, there are several options to calibrate your device.* Pro version added Features:- True north- Sending GPS info via SMS and Email- Full metal detector- Qibla finder, Car locator- GPS Speedometer- No ads, No connection* Do you want more tools?Get [Smart Compass Pro] and [Smart Tools] package.For more information, see the manual, Youtube video and the blog. Thank you.** Especially on SGS4, a view-cover with magnets can make the compass inaccurate. Remove it right now !!** The compass app requires a magnetic sensor. If there is a sensor error, please check your phone's specification.