Shipwreck find could be legendary 'sunstone' An oblong crystal found in the wreck of a 16th-century English warship is a sunstone, a near-mythical navigational aid said to have been used by Viking mariners.
07 March 2013
China launches rival GPS satellite systemChina has launched commercial and public services across the Asia-Pacific region on its domestic satellite navigation network built to rival the US global positioning system.