Geolocation getCurrentPosition()

navigator.geolocation.getCurrentPosition(success, error, options)

var options = {
  enableHighAccuracy: true,
  timeout: 5000,
  maximumAge: 0
};

function success(pos) {
  var crd = pos.coords;

  console.log('Sua posição atual é:');
  console.log('Latitude : ' + crd.latitude);
  console.log('Longitude: ' + crd.longitude);
  console.log('Mais ou menos ' + crd.accuracy + ' metros.');
};

function error(err) {
  console.warn('ERRO(' + err.code + '): ' + err.message);
};

navigator.geolocation.getCurrentPosition(success, error, options);