As a taxi driver I have always carried a local copy in the cab...sometimes more than just 1 area too. Unlike satnav...the A-Z is seldom wrong and as it's based on Ordinance Survey if it's not in then apart from brand new builds.....then it's not there. Satnav is based on O/S but the navigation side often takes you the longer route when the are shorter routes available.....that matters in a taxi.
This is too big for a pocket map but perfect for in the car. Easy to use and turn the pages right back due to the spring style spine. Great value for the money.