I had the RAC satnav, what a load of toss.
Despite buying it early summer, the software was years out of date (yet the date said it was only 6 months out!) and RAc refused to give me a free upgrade to latest software.
It couldn't find lots of places, some were housing estates that had been around for ten years!
In the end I took it back to Argos & told them it kept turning itself off.
Bought a tomtom - which did find all those addresses - before I connected to the PC.
And when I did connect, I was given the option to download their very latest maps for free.
And another thing, if you drive anything large, don't rely on the satnav - despite being able to tell it I was in a bus/lorry, it still took me through some almost impassable routes.
"in 100 yards, turn right"
"now turn right"
FFS, I can't turn right, it's not allowed. I cannot drive over the central reservation.
At least my tomtom knew that.
Forgot to add. Tesco have some in for £57. Not sure what brand etc but for that price might be worth a look?