I recently read something on a London thread about the unrealiability of sat navs on winding country roads and now I'm worried. We'll be driving all over England and Wales from the U.S. (our first visit) in May. I got a sat nav for Christmas and am going to be purchasing and downloading maps of Great Britain. The last thing I want to do is have my DH, who's going to be doing all the driving to get lost.
Also, I'm confused if I need to buy an SD card with the maps or a DVD (would one be more updated than another?) I have a Garmin Nuvi 40LM and I'm hoping to buy maps that will let me download all the addresses of places I'm hoping to visit ahead of time using the computer keyboard but don't know if this is possible. Thanks for the advice.