If you go to the NOAA web site to download the free charts, once you have a set that suits you the trick in keeping them up to date is to choose "Sort by: Edition Date". This will list the most recent released charts. For instance, there are 3 recent charts dated Nov. 1, 2005, the rest are all October 1 or earlier. If you had not downloaded these 3 charts you could select them and place your download order. Once a month sometime after the first, you could do the same sort and check for new editions and download whatever has been just released. At the moment I am only interested in the west coast, so until one or more of these charts are released, I will just keep checking. In this manner you can incrementally keep your charts up to date, absolutely. http://nauticalcharts.noaa.gov/mcd/Raster/download.htm Mike Capt. Mike Maurice Tualatin(Portland), Oregon