Fourth Arm of Defense
The merchant marine, often called the fourth arm of defense, is a fleet of American cargo ships. According to the U.S. Merchant Marine Academy, There are tankers traveling along the west coast with raw petroleum for our refineries; Great Lakes vessels loaded with iron ore, coal or other minerals for America's industry; huge containerships in Eastern ports, their box-like containers filled with manufactured goods; general cargo ships in the Gulf unloading pallets of coffee and crates of fruit; tugboats pushing and pulling barges carrying the Midwest's grain.
These kinds of vessels, owned by U.S. companies, registered and operated under the American flag, comprise the U.S. merchant marine. This fleet of highly productive ships is a major part of our system of commerce, helping guarantee our access to foreign markets for sale of our manufactured goods.
By Stuart Thornton
Wednesday, April 13, 2011
John is the captain of the Sheila McDevitt, a 179-meter (587-foot) cargo vessel that hauls dry bulk goods, including coal, phosphate, dry cement, grain, corn, rice, and sugar.
Speaking from his home in Burnet, Texas, John is modest about his responsibilities. “Overall management is really what I do for the most part,” John says of his job. “I do some navigation duties entering and leaving port also.”
Growing up in Palmetto, Florida, John spent a lot of time in and around the water. “From my earliest age, I was at home in the water,” he says. “I’d run out every morning and jump in the water and swim and boat and fish. I had rowboats and sailboats and canoes and everything else that would float.”
John’s father was a commercial fisherman, and his grandfather used to run freight schooners. John learned a lot about boating while going out on the water with his father. “Sometimes, it was scary,” he says. “I just got respect for the sea early on . . . boats being out in bad weather sometimes.”
After studying naval architecture at the University of Michigan at Ann Arbor, John realized he would rather be out on the water than indoors. John was accepted at the U.S. Merchant Marine Academy in Kings Point, New York, where he graduated in 1984.
MOST EXCITING PART OF YOUR WORK
“I just love the traveling,” John says. “I just like to be able to go to all the different places and see the life there. It’s not always very nice places, but it’s interesting just the same.”
MOST DEMANDING PART OF YOUR WORK
“[Making sure] that everything is ready, that the vessel is ready to discharge cargoes, that the machinery is in good condition.”
HOW DO YOU DEFINE GEOGRAPHY?
“I think of basically sea lanes, and how I get from one place in the world to the next by ship.”
John says he always has to consider geographic features, including ocean currents and weather patterns, when he is planning safe routes for the Sheila McDevitt.
Traveling to places like China, East Africa, and even North Korea for his job, John has had to deal with many issues in human geography. “When I get into ports, I’m dealing with a lot of different cultures, different rules, different governments and things like that,” he says.
When John first became a captain, he used sextants and LORAN, a radio navigation system, to pinpoint where he was. “Now with GPS, it’s become very easy as far as open ocean navigation,” he says. “We know where we are all the time.”
SO, YOU WANT TO BE A . . . CREWMEMBER OR SHIP’S CAPTAIN
“If you are deck side or even if you go to the engineering side, the sciences are pretty important.”
If you live by the water, take an introductory sailing or boating course.
John says you can familiarize yourself with navigation without using a lot of tools. “With a GPS receiver and latitude and longitude, you can actually pull out a chart or a map and start plotting positions,” he says, “That’s always good practice, or a good way to know if you have an interest in that or not.”
Term Part of Speech Definition Encyclopedic Entry canoe noun, verb
small, open boat with pointed ends.
person in command of a ship or other vessel.
goods carried by a ship, plane, or other vehicle.
hard material used as a building material or a binding agent for stronger building materials such as concrete.
type of map with information useful to ocean or air navigators.
Encyclopedic Entry: chart coal Noun
dark, solid fossil fuel mined from the earth.
commercial fishing Noun
industry responsible for catching and selling fish.
steady, predictable flow of fluid within a larger body of that fluid.
Encyclopedic Entry: current deck Noun
top surface or "floor" of a ship or other open structure, such as a highway or bridge.
the art and science of building, maintaining, moving, and demolishing structures.
to understand how something works or operates.
goods transported by air, land, or sea for profit.
Global Positioning System (GPS) Noun
system of satellites and receiving devices used to determine the location of something on Earth.
system or order of a nation, state, or other political unit.
GPS receiver Noun
device that gets radio signals from satellites in orbit above Earth in order to calculate a precise location.
harvested seed of such grasses as wheat, oats, and rice.
Encyclopedic Entry: grain human geography Noun
the study of the way human communities and systems interact with their environment.
distance north or south of the Equator, measured in degrees.
Encyclopedic Entry: latitude longitude Noun
distance east or west of the prime meridian, measured in degrees.
Encyclopedic Entry: longitude LORAN Noun
(LOng RAnge Navigator) radio navigation system.
symbolic representation of selected characteristics of a place, usually drawn on a flat surface.
Encyclopedic Entry: map modest Adjective
refusing to draw attention to oneself.
naval architecture Noun
branch of engineering dealing with the design, construction, and operation of marine vehicles.
art and science of determining an object's position, course, and distance traveled.
Encyclopedic Entry: navigation phosphate Noun
type of salt used as fertilizer. Excess phosphates can choke freshwater ecosystems.
to form a path based on calculations.
place on a body of water where ships can tie up or dock and load and unload cargo.
Encyclopedic Entry: port radio navigation Noun
method of navigation based on the source of radio waves being broadcast to determine a vessel's position.
path or way.
watercraft that is maneuvered by oars.
aquatic vessel that uses wind to maneuver and move.
large sailing vessel with at least two equal-sized masts.
sea lane Noun
navigation route used by ships.
tool used by navigators to determine latitude and longitude.
state of the atmosphere, including temperature, atmospheric pressure, wind, humidity, precipitation, and cloudiness.
Encyclopedic Entry: weather weather pattern Noun
repeating or predictable changes in the Earth's atmosphere, such as winds, precipitation, and temperatures.