Macquarie Island field base stations for differential GPS

Using a Leica differential GPS system, together with existing survey marks at the main station, highly accurate (plus/minus 5cm) base stations were installed at 3-6 km intervals from the Macquarie Island station to just south of Green Gorge. The location of each base station was calculated using existing survey marks or the previously set up base station. Each location has been marked with a survey stake and covered with a rock cairn.