Hi, I downloaded the GPS satnav app for iphone 4 yesterday.

On itís own in the car, the thing wonít speak to me either with voice on or voice off. It speaks when I ask for a route and then that's that. Can you suggest reasons why that might be please?

If I connect it to the USB socket in the car, however, (itís a Ford Galaxy MK3) and play music from the phone, the satnav works fine and it does speak to me and itís great because it comes through the carís stereo. However, if I switch to radio (DAB), the thing stops talking to me again. Can you suggest how I can switch between loaded music on my iphone and the radio and still keep navigation instructions coming through please?