Frank B. I downloaded a couple of them I was interested in and you have to have a program to view them. A navigation program to use these ENC's cost a little, but the charts are free and they bypass all the companies who use NOAA as a source of charts and reformat them to fit their own charting programs. NOAA doesn't supply any charting, or viewing programs. Not all areas presently charted are available at this time, but they are working on it. Russ Hughes Slo-N-Easy Richland Wa.