Even if you're a good map reader (which I am) there are still good reasons to have the SatNav. When I'm driving solo it's the only way I can be sure to find my way more or less to the right place, if I've never been there before or if I have to deal with a one way system. I've had Google directions before, but you can't read those in the dark if you're on your own and somehow there's never a chance to pull over and consult them when you most need to.
The only thing to watch out for, Les, is that whatever you buy is capable of being updated fairly regularly. We have two TomToms (tomtomtomtom) because my husband couldn't resist picking up one that was being sold off cheap in Maplins and needed a bit of tweaking, and even though we keep them up to date there are still odd bits of road they don't recognise, and this is important if you're dealing with new roads in unfamiliar areas.
And we have John Cleese programmed into mine as the Voice, which is great for having arguments on my own when he's telling me to do something I don't want to do (like go round the M25).

Anne