One way we bring you new product features is through Google Labs—a collection of fun, experimental features you can turn on if you’re interested in the functionality. In fact, Google Maps itself started as a lab. In addition to our desktop Maps Labs, Google Maps for Android has a few tricks you can try out right from your phone. We’d like to introduce you to one new experimental feature, “Download map area," but also remind you of two other ones we already have: “Scale bar” and “Measure.”
Download map area
When you’re visiting an unfamiliar location, Google Maps for mobile is great for getting an idea of how close you are to your destination, where streets and landmarks are in relation to each other, or just for getting “un-lost.” But what if you don’t have a data signal, or you’re abroad and don’t have a data plan? We say that if you use Google Maps for mobile, you’ll never need to carry a paper map again. The “Download map area” lab in Google Maps 5.7 for Android is a step in making that statement true even when you’re offline.
Read more herehttp://googlemobile.blogspot.com/2011/07/download-map-area-added-to-labs-in.html