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Commerce – buying and selling of goods for money

Dredging – removing the earth from the ocean floor by using a series of buckets or a scoop

Exclusive Economic Zone – the coastline of the United States from 3 miles to 200 miles from shore

Lead line – a rope marked with numbers, once used to gather information about water depths

LIDAR – a system that uses light waves to measure water depths in clear water

Nautical chart – a kind of map that gives boaters information to find their way around

Navigation – finding your way from one place to another

Sonar – a system that uses sound waves to “see” in the water

Towfish – the tool used to take side scan sonar measurements