This is a great way to turn your laptop into a complete navigation system. Just load the DVD in your computer and you have instant access to over 2200 of the latest raster navigation charts produced by NOAA. SeaClear ll Navigation software plus several reference books and more. All this for only $19.95 at www.marine-laptop-gps.com The charts are updated bi-weekly so you will receive the latest editions. NOAA Raster Navigational Charts® are full-color, geo-calibrated, high detail, digital images of NOAA's entire suite of paper charts. They display beautifully with all the details found on the paper charts that you are used to using. They are better though, because you can overlay electronic navigation elements right on top of the chart.