hgv1driver

Hi, can anyone help??, i don't know where to start as i am not sure if you can do this BUT i don't want a gps or anything, but can you download a map of say Berkshire onto a PDA so i can put a postcode in and get the road up on the screen, i don't need to know how to get there, just like i can do on my computer put a disc in of "AUTOROUTE GB 2005" type in postcode and map comes up of road, i am a courier and get money deducted when taking deliveries back !!!.

Jon