bigO...pilot
charts are planning
charts...not navigational
charts. There are pilot chart links here...just enter into search...and you will find many that have been added in the last week or so.
If it is REAL navigational
charts you are looking foor, then I am not aware of any free ocean
charts BUT the entire USA coast and PR and the USVI are available for both viewing and download for free. Here's a pdf of what you can get for free:
http://nauticalcharts.noaa.gov/mcd/c..._10_Jan_06.pdf