Thanks for the replies guys.
A new head unit sounds like the way to go. However, using google maps from the phone is, in the most part ok, but I live near many country borders.
Whilst about 70-80% of the time, it'll all be fine, I don't want to get into massive data roaming charges on the phone as soon as I travel over a border. I only need to nip down the road to the shops and the phone will switch to the network of another country.
Without spending hours googling all this, which of course I could do, does nayone have experience of replacing the head unit with one that has satnav integrated in it? Bluetooth too, to access phone contacts and other things.
OR, perhaps a unit I can send a route to from my phone oe email and access directly on the head unit. Does this even exist?
Appreciate any advice.