On China's southern Hainan island, a fishing boat captain shows a Reuters reporter around his aging vessel. He has one high-tech piece of kit, however: a satellite navigation system that gives him a direct link to the Chinese coast guard should he run into bad weather or a Philippine or Vietnamese patrol ship when he's fishing in the disputed South China Sea.

By the end of last year, China's homegrown Beidou satellite system had been installed on more than 50,000 Chinese fishing boats, according to official media. On Hainan, China's gateway to the South China Sea, boat captains have paid no more than 10 percent of the cost. The government has paid the rest.

It's a sign of China's growing financial support for its fishermen as they head deeper into Southeast Asian waters in search of new fishing grounds as stocks thin out closer to home.