What is the geoid?
From NOAA While we often think of the earth as a sphere, our planet is […]
glossary
What is a datum?
From NOAA A geodetic datum is an abstract coordinate system with a reference surface (such […]
What is a perigean spring tide?
From NOAA What is a perigean spring tide? A perigean spring tide occurs when […]
What is the difference between a threatened and endangered species?
From NOAA Under the Endangered Species Act, a species may be listed as either threatened […]
What is the difference between a nautical mile and a knot?
From NOAA A nautical mile measures distance and a knot measures speed. A nautical mile […]
What is seaweed?
From NOAA Some seaweeds are microscopic, such as the phytoplankton that live suspended in the […]
What is a Storm Surge?
From NOAA Storm surge is the rise in seawater level caused solely by a storm. […]
What is bathymetry?
From NOAA The term “bathymetry” originally referred to the ocean’s depth relative to sea level, […]
What is the Mariner’s 1-2-3 Rule?
From NOAA The Mariner’s 1-2-3 Rule is the guideline mariners follow to keep out of […]
What is “seaspeak”?
From NOAA Seaspeak is the official language of navigators the world over. Have you ever […]