docs: function(successCallback, errorCallback, options) {
              argscheck.checkArgs('fFO', 'compass.getCurrentHeading', arguments);
  
              var win = function(result) {
                  var ch = new CompassHeading(result.magneticHeading, result.trueHeading, result.headingAccuracy, result.timestamp);
                  successCallback(ch);
              };
              var fail = errorCallback && function(code) {
                  var ce = new CompassError(code);
                  errorCallback(ce);
              };
  
              // Get heading
              exec(win, fail, "Compass", "getHeading", [options]);
          }