private static void stopService(final Activity activity) {
        synchronized (startingActivityLock) {
            if (activity.stopService(new Intent(activity, SpeechService.class))) {
                ActivityMixin.showShortToast(activity, activity.getString(R.string.tts_stopped));
            }
            startingActivity = null;
        }
    }
Return distance required to be moved based on overall distance.<br>

@param distance in km
@return delta in km
main/src/main/java/cgeo/geocaching/speech/SpeechService.java