GoPro, whose cameras are used by surfers, skydivers and other action junkies, said it was focusing on Japan, Korea and China markets. “It appears that entry in China which happened in January is off to a good start and it feels like they got fairly high expectations for that to continue in (second quarter),” Dougherty & Co analyst Charles Anderson told Reuters. GoPro, which claims to make the five top-selling camera or camcorders in the United States, has said expansion outside the U.S. market is key to its efforts to boost revenue growth.