http://www.nauticalcharts.noaa.gov/mcd/enc/[
^]
here you go, maps and a hint where to start. Stick to S57 maps, as S63 need a license key and some serious action (including license costs).
You can get the complete US Sea maps for free, which is pretty awesome for testing and presentation purpose.
EDIT: If you want serious maps, you should check www.chartworld.com.