To use the NOAA soft charts, ya have to download a software program to read them. The "Seaclear" is a good one that is free.. There are a few out there.. Many for dollars but a few free ones that are very good and can "talk" to a GPS receiver (hocky puck) through the UBS port for real time navigation. I think there are some trial programs on the NOAA site that are free to download, like Nav Pac Pro, etc.. Search the archives here for free software and you'll find a thread from a few months back that had a discussion of several programs. Happy Hunting !