node-gps-heading

npm install node-gps-heading --save

var gpsHeading = require('node-gps-heading');
 
var gps1 = {
  lat: -31.0000000,
  lng: 115.8480000
}
 
var gps2 = {
  lat: -32.0000000,
  lng: 115.8480000
}
 
gpsHeading.calculate(gps1, gps2, function(heading) {
  console.log(heading.degree);
  console.log(heading.radian);
});
 
var heading = gpsHeading.calculateSync(gps1, gps2);
console.log(heading.degree);
console.log(heading.radian);

npm test