Full resolution NOAA Nautical Charts for printing Unofficial site (verify that chart is up to date)

NOAA Online Nautical Chart Viewer Official site for NOAA source files

NOAA BookletChart Online utility to download and print portable charts (nice for quick reference)

Atlantic Coast
Gulf Coast
Pacific Coast
Alaska
Great Lakes

NOAA Raster Navigation Charts

OceanGrafix Nautical Chart POD (Print On Demand)

NOS Tools and Resources Downloads for chart viewers, GIS tools, and data feeds

NOS Data Explorer Environmental Sensitivity Index maps and data (shorelines, biological resources, and human-use resources)

World Seaport Index Lists position, time zone, max draft, port contact information, and international phone dialing code

Voyage Calculator Distances at sea and ETA calculation

Astronomical Applications and Calculators Sun and moon, almanacs, celestial navigation tools