I have a question I was hoping someone could help me with. Basically I have a new HU with built in bluetooth which is dead handy for phone calls on the move but I need a sat nav app too. So my question is there a sat nav app that is bluetooth enabled so you can have voice instructions through the HU as well as phone calls etc. So if your driving along listening to some music (too loud to hear your phone) and you need to make a turn, the music volume drops while the instructions are given just like when you get a call? If this doesn't exsist can someone invent it by tomorrow please?