Bearing angle is not correct, except North=0

[gordon4liu]

Hi ,
At first , I run the calibration.ino ont the GY-271(QMC5883L). and get the calibration data.
I copy its to bearing.ino.

And then I run the bearing.ino.
The North is 0 deg, NE=2 deg, E=4, SE=5, S=6, SW=7, W=4, NW=8.
Does it SW or HW issue??

=== bearing.ino ==
#include <QMC5883LCompass.h>
QMC5883LCompass compass;
void setup() {
Serial.begin(9600);
compass.init();
compass.setCalibrationOffsets(41.00, -159.00, -436.00);
compass.setCalibrationScales(1.09, 0.93, 0.99);
}
void loop() {
compass.read();

byte a = compass.getAzimuth();
// Output here will be a value from 0 - 15 based on the direction of the bearing / azimuth.
byte b = compass.getBearing(a);

Serial.print("B: ");
Serial.print(b);
Serial.println();

delay(250);
}

[microstoc]

I had what seems a similar problem.
Rotating clockwise, the readings went N NE E SE S and then straight back to N. Nothing in the W region.
Long story short, the azimuth readings were going 0 45 90 135 180 and then -180 -135 -90 -45.
I corrected for this using ... if(azimuth<0){azimuth=360+azimuth};

HTH