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Deep in the South China Sea the nuclear-powered aircraft carrier, USS Carl Vinson, has a point to make.
"It shows resolve, and gives decision space to our leaders," the ship's commanding officer, Captain Doug Verissimo, said.
"When they put a carrier strike group somewhere it helps to show that the United States is interested.
"We don't have a lot of these, so when you put one in a certain area it has some influence.
"Of course it also gives our diplomats time and space to negotiate and make decisions, ultimately to try and prevent any type of armed conflict."
The Carl Vinson is the flagship of a strike group from the US Third Fleet.
The other vessels are here — but you can't see them.
Somewhere over the horizon, guided missile cruisers and destroyers form a protective shield around the aircraft carrier.
No-one on board will say it so bluntly, but the ship is sailing through the South China Sea to send a deliberate message: these waters aren't China's alone.
China has built airstrips and ports on reefs and shoals throughout the sea in defiance of a ruling from an international tribunal in the Hague.
"We want to keep laws and norms in place that we don't change the map along the way, to avoid frictions," Captain Verissimo said.
"As you change maps it creates new frictions and new issues."
He doesn't mention it by name, but the only nation trying to change the map out here is China, which has drawn a so-called "Nine Dash Line" around waters it claims as its own.
It doesn't want anyone going near any of its artificial islands.
The strike group's commander, Rear Admiral John Fuller, won't reveal where he's planning on sailing during this mission but it's clear he's not charting his course using China's map.
"I will say our navigation is very good and we know where international law says we can operate and I know where international law says we can't. And we're going to do what international law says we can do."
The ship's commanding officer describes the Carl Vinson as a floating city — it has a dental surgery, gyms, a Starbucks cafe, armed guards, Friday night karaoke and even a chapel that holds services for Catholics, Protestants, Buddhists … and Wiccans.
There's a permanent crew of 3,000 — and another 2,000 people on board associated with the ship's aircraft: about 70 planes, including FA18 Super Hornets and Hornets, EA 18G Growlers, Nighthawk helicopters and surveillance aircraft.
I'm on board of the Vinson along with media from the Philippines — the nation with perhaps the most to lose from Chinese expansion in the South China Sea.
China's already blocked Filipino fishermen from the lucrative fishing ground around Scarborough Shoal.
The US is making a big deal of this trip because it wants to show Filipinos that it stands with them in keeping the South China Sea open.
The ship is moving between an old ally and a new one … and another nation concerned about China's island-building in these waters.
The Carl Vinson began this leg of its journey in Manila and it'll drop anchor next off Danang, Vietnam.
It'll be the first visit from a US aircraft carrier since the end of the Vietnam War.
This time the fighter jets will be stowed away.
Vietnam, China, Malaysia have eyes on the prize
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Rich in resources and traversed by a quarter of global shipping, the South China Sea is the stage for several territorial disputes that threaten to escalate tensions in the region.
At the heart of these disputes are a series of barren islands in two groups - the Spratly Islands, off the coast of the Philippines, and the Paracel Islands, off the coasts of Vietnam and China.
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Both chains are essentially uninhabitable, but are claimed by no fewer than seven countries, eager to gain control of the vast oil and gas fields below them, as well as some of the region's best fishing grounds.
Indonesia, Malaysia and Brunei have made claims to part of the Spratlys based on the internationally recognised Exclusive Economic Zone (EEZ), which extends 200 nautical miles from a country's coastline.
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Based on the EEZ, the Philippines has the strongest claim on the Spratlys and their resources, with its EEZ covering much of the area.
However the lure of resources, and prospect of exerting greater control over shipping in the region, means that greater powers are contesting the Philippines' claims.
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China has made extensive sovereignty claims on both the Spratlys and the Paracels to the north, based largely on historic claims outlined in a map from the middle part of the 20th Century known as the 'Nine Dash Map'.
Taiwan also makes claims based on the same map, as it was created by the nationalist Kuomintang government, which fled to Taiwan after the communists seized power in China.
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Vietnam also claims the Spratlys and the Paracels as sovereign territory, extending Vietnam's EEZ across much of the region and bringing it into direct conflict with China.
There have been deadly protests in Vietnam over China's decision to build an oil rig off the Paracels.
One Chinese worker in Vietnam was killed and a dozen injured in riots targeting Chinese and Taiwanese owned factories, prompting 3,000 Chinese nationals to flee the country.
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EEZ can only be imposed based on boundaries of inhabitable land, and this has prompted all the countries making claims on the region to station personnel, and in some cases build military bases out of the water, to bolster their claim.
Building and protecting these structures has resulted in a series of stand-offs between countries in the region, each with the potential to escalate.
China has been leading the charge with these installations, and has deployed vessels to the region to protect their interests.
Chinese coast guard vessels have used a water cannon on Vietnamese vessels, as well as blockading an island where the Philippines has deployed military personnel.
Topics: world-politics, defence-and-national-security, defence-forces, navy, china, united-states
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