Since SFOS 4.0 the spoken navigation isn't routed to a bluetooth headset/speaker/car kit anymore. Music plays fine over bluetooth, but Pure maps, using PicoTTS, always plays on the phone's speaker. Before 4.0 I had no issues. I was hoping the issue would resolve itself on upgrade to 4.1, but it didn't. Is it a OS-bug? Pure maps bug? Something else? It's kind of unfortunate, as it worked excellent using my car kit