I've been using my phone as a satnav, but would really like a proper satnav. Can anyone recommend one? How do you fix them into the car? All holders I've had for my phone have been rubbish, falling down mid journey, breaking etc. The best so far has been a sort of rubber/silicone mat with slots to hold the phone. It doesn't attach in any way, but rarely moves around. I still feel it would fly around if I had to slam on the brakes though.