"Google Maps has always been, and continues to be, a fundamentally Internet-connected experience, meaning you always get the freshest map and place data, search and voice search, live traffic conditions, satellite and Street View imagery, and much more. Still, we understand that mobile Internet connections aren’t 100% reliable. So today we’re happy to take the first steps toward greater offline reliability, so you can find your way even if you lose your connection. In the past, you’ve probably had frustrating moments when you get stranded without a map, whether ducking into the subway, sitting at the back of a restaurant or traveling anywhere with a flaky Internet connection. But dynamically drawing maps requires 100 times less data to get maps across all zoom levels, so now we’re able to proactively cache (or store) large areas on your device based on where you use Maps the most. This way, you can rely on having fast, robust maps available to you where you’re most likely to need them." - Allison Kipta from Bookmarklet