【實用旅遊app】Chart Sack|最夯免費app-綠色工廠好玩App

Chart Sack lets you navigate on any chart of your choice. You can download a topographic map from the Internet, scan a paper map from your shelf, or even draw one yourself. The only requirements for the charts are that they are to scale, and are in one of JPEG, BMP, GIF, or PNG format.