heading property

Heading, angle of rotation about the -Z axis (in radians). This value represents the angle between the device's Y axis and the magnetic north pole. When facing north, this angle is 0, when facing south, this angle is pi. Likewise, when facing east, this angle is pi/2, and when facing west, this angle is -pi/2. The range of values is -pi, pi.

Example:

// Get heading (angle of rotation about the -Z axis in radians)
double? heading = position.heading;
if (heading != null) {
 print("Heading: $heading radians");
}