[main function] * Compass - Compass and magnetic field strength Displays user location information in real time. * Real-time map - Draw a compass on a map, showing your location in real time. * Level meter - Provides a leveling function. Includes calibration features. [Precautions] * If the magnetic field strength is high, the accuracy of the compass will decrease. * The accuracy of the sensor of the smartphone may be deteriorated depending on the influence of the surrounding environment. *