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compassCallback = function (orientation) {
                var heading = 360 - orientation.alpha;
                if (compassReady) {
                    if (successCallback)
                        successCallback( new CompassHeading (heading, heading, 0, 0));
                    window.removeEventListener("deviceorientation", compassCallback, true);
                }
                compassReady = true;
            };
            compassReady = false; // workaround invalid first event value returned by WRT
            window.addEventListener("deviceorientation", compassCallback, true);
        }
        else {
            if (errorCallback)
                errorCallback(CompassError.COMPASS_NOT_SUPPORTED);
        }
    },compassCallback = function (orientation) {
                var heading = 360 - orientation.alpha;
                if (compassReady) {
                    if (successCallback)
                        successCallback( new CompassHeading (heading, heading, 0, 0));
                    window.removeEventListener("deviceorientation", compassCallback, true);
                }
                compassReady = true;
            };
            compassReady = false; // workaround invalid first event value returned by WRT
            window.addEventListener("deviceorientation", compassCallback, true);
        }
        else {
            if (errorCallback)
                errorCallback(CompassError.COMPASS_NOT_SUPPORTED);
        }
    },compassCallback = function (orientation) {
                var heading = 360 - orientation.alpha;
                if (compassReady) {
                    if (successCallback)
                        successCallback( new CompassHeading (heading, heading, 0, 0));
                    window.removeEventListener("deviceorientation", compassCallback, true);
                }
                compassReady = true;
            };
            compassReady = false; // workaround invalid first event value returned by WRTcompassCallback = function (orientation) {
                var heading = 360 - orientation.alpha;
                if (compassReady) {
                    if (successCallback)
                        successCallback( new CompassHeading (heading, heading, 0, 0));
                    window.removeEventListener("deviceorientation", compassCallback, true);
                }
                compassReady = true;
            };
            compassReady = false; // workaround invalid first event value returned by WRTsetTimeout(function () {
                lose(CompassError.COMPASS_NOT_SUPPORTED);
            }, 0);
        } else {setTimeout(function () {
                lose(CompassError.COMPASS_NOT_SUPPORTED);
            }, 0);
        } else {getHeading: function (win, lose) {
        var deviceCompass = Windows.Devices.Sensors.Compass.getDefault();
        if (!deviceCompass) {
            setTimeout(function () {
                lose(CompassError.COMPASS_NOT_SUPPORTED);
            }, 0);
        } else {
            var reading = deviceCompass.getCurrentReading(),
                heading = new CompassHeading(reading.headingMagneticNorth, reading.headingTrueNorth, null, reading.timestamp.getTime());
            setTimeout(function () {
                win(heading);
            }, 0);
        }
    },
    stopHeading: function (win, lose) {getHeading: function (win, lose) {
        var deviceCompass = Windows.Devices.Sensors.Compass.getDefault();
        if (!deviceCompass) {
            setTimeout(function () {
                lose(CompassError.COMPASS_NOT_SUPPORTED);
            }, 0);
        } else {
            var reading = deviceCompass.getCurrentReading(),
                heading = new CompassHeading(reading.headingMagneticNorth, reading.headingTrueNorth, null, reading.timestamp.getTime());
            setTimeout(function () {
                win(heading);
            }, 0);
        }
    },
    stopHeading: function (win, lose) {