A seven-meter (23-foot) long, wind-powered unmanned surface vehicle (USV) called a Saildrone  has become the first unmanned system to circumnavigate Antarctica. The vehicle, known as SD 1020, was equipped with a suite of climate-grade sensors, and collected data in previously unchartered waters, enabling new key insights into ocean and climate processes. The 196-day mission was launched from Southport in Bluff,…