I'm at my brother's house tonight and we were just reading the comment by Amy on the previous entry about the supermarket app. He just showed me something else just as useful.
On a smart phone, well on mine and on his, is "Places" or "Google Places". You can type in "supermarkets" and it shows you a list of all those nearby. It tells you the distance of each one from your current location and you can choose to see one on a map, and you can get walking or driving directions. Fantastic!!