Ocean Facts

Answers to your questions about our oceans and coasts.

Transportation:

What is a Plimsoll line?

What is the mariner's 1-2-3 rule?

What is the difference between an AUV and a ROV?

What is the difference between a nautical mile and a knot?

What is a historical map or chart?

What is air gap?

What is the EEZ?

What is a navigation response team?

How is bathymetric data used?

What is bathymetry?

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?

What is a sonar?

What is hydrography?

How important is the ocean to our economy?

What role does the Ocean Service play with our nation's aircraft and airports?

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