National Ocean Service
National Oceanic and Atmospheric Administration
U.S. Department of Commerce
Explore All Topics
Just for Kids
Sea Floor Mapping
Prince William's Oily Mess
The Lionfish Invasion
Planet Stewards Program
Sea Level Rise
The Earth Scientist
Oysters In the Chesapeake Bay
Living in Weather
Ocean & Climate
Tides & Currents
Discover Your World
Discover Your Changing World
• What are the Totten Beacons?
• What are the Roaring Forties?
• What are the trade winds?
• What are the doldrums?
• What is GPS?
• What is the Great Loop?
• What is seaspeak?
• What is a High Seas Forecast?
• What is a bight?
• What is PORTS®?
• What are the horse latitudes?
• What is dredging?
• Why do we name tropical storms?
• Why do mariners use port and starboard instead of left and right?
• What is a Plimsoll line?
• What is the mariner's 1-2-3 rule?
• What is shoreline armoring?
• How do I get NOAA nautical charts?
• What is a historical map or chart?
• What is the Storm QuickLook?
• What is air gap?
• What is Natural Resource Damage Assessment?
• What is a navigation response team?
• How long is the U.S. shoreline?
• Why is data on currents important?
• What is the Great Pacific Garbage Patch?
• How is bathymetric data used?
• What is bathymetry?
• How is ocean observing data used?
• What is maritime heritage?
• Why do we study tides?
• What is geodesy?
• How long does it take to produce a nautical chart?
• What do the numbers mean on a nautical chart?
• What is a nautical chart?
• What's the difference between a nautical chart and a map?