@SuppressWarnings("deprecation")
    private void speak(final String text) {
        if (!initialized) {
            return;
        }
        tts.speak(text, TextToSpeech.QUEUE_FLUSH, 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