November 27, 2007: The Indonesian Navy has received the two of four SIGMA class corvettes from the Dutch builders in the last few months. These ships displace 1,700 tons, are 281 feet long and have a crew of 80. Armament consists of a 76mm gun, two 20mm guns, eight Mistral anti-aircraft missiles, six torpedoes and four anti-ship missiles (either French Exocet or Chinese C802). There are radars for navigation, surveillance air defense, as well as sonar. These ships can stay at sea for about 28 days at a time, and cost about $490 million each.