Systems and methods for detecting positions

Systems and methods for detecting positions are provided. First, a reference point is recorded by a first mobile device. Then, a movement, an acceleration, and an orientation of the first mobile device are detected by at least one sensor. Then, after a predetermined time interval, a relative displacement between the reference point and the first mobile device is calculated according to the predetermined time interval, and the data detected by the at least one sensor, and the relative displacement to the first mobile device is transmitted to a second mobile device.