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NOAA Nautical Charts - (PDF format - Booklet Charts and other options)
NOAA Nautical Chart - Green Bay - 14910 - PDF (full)
USCG Navigation Center - Main Page
Light Lists (Green Bay is in District 9) - updated weekly
Local Notices to Mariners - updated weekly (subscribe to free email updates)
Report a discrepancy with a navigational aid
Report a problem with a nautical chart
Fox River Locks (with schedule)