Arduino gy271 compass, start and remember 1st heading

#include <QMC5883LCompass.h>

QMC5883LCompass compass;
int Read1stAngle = 0;
int StartAngle = 0;

void setup() {
  Serial.begin(115200);
  compass.init();
}

void loop() {

  int Direction;
  char myArray[3];
  compass.read();
  Direction = compass.getAzimuth();

  if ( Read1stAngle == 0 ) {   //Store start angle
    StartAngle = Direction;
    Read1stAngle = 1;
  }

  Serial.print("Heading: ");
  Serial.print(Direction);
  Serial.print(" / StartAngle: ");
  Serial.print(StartAngle);
  Serial.print(" / Read1stAngle: ");

  delay(250);
}