MotionX-GPS Drive requires only a small amount of disc space on your iPhone since it only downloads only the maps you need. When you calculate a route, map tiles along your route are downloaded for 25-50 miles ahead of your current position. As you drive the route, MotionX continues to store map tiles ahead of your position. This helps to prevent missing map tiles when your iPhone loses it’s data connection. If you anticipate large stretches of driving without a data connection, you can pre-load map tiles along a route using the Nav Choices button when viewing your destination address. You can pre-load maps from your current position or from an alternate starting point. Due to licensing agreements, MotionX-GPS Drive does not support the download of maps for large geographic areas such as an entire city or state.