sorry if this already has been asked, but does anyone know about the compatibilty between Treo 650 and Jabra BT 100 headset and TomTom Navigator/BT GPS receiver? I mean is it possible to receive calls with a Jabra BT100 headset without interrupting a BT GPS trip ? (Simultaneous BT communication but 2 differnt kinds of). I remember having read that voice BT is different from GPS (data?) BT communication. Thanks for your advise.