Hi, I have just taken delivery of a '58 Astra VXR with a CD70 and I have scoured the manuels to find out how to turn off the radio while still leaving the sat nav on. If I use the OI switch the satnav and radio turn off. Reducing the volume doesn't help as I then am unnable to hear the NAVI announcements. It could well be tha there is an obvious way of navigating in silence for those periods when you don't want to listen to a CD or the radio which I am missing, if so PLEASE HELP as it is driving me nuts. Vuaxhalls integration of the different multimedia systems is challenging to say the least.