Ice Tracker data of Arctic sea ice during the MOSAiC expedition 2020-2021

Ice trackers were manufactured by Pacific Gyre (www.pacificgyre.com). The trackers are designed to survive harsh environments and ice conditions and are air-deployable at ~40 m or less. The trackers record GPS positioning and are equipped with Iridium 2-way satellite telemetry (the specification of the ice tracker can be found on the Pacific Gyre website, www.pacificgyre.com/ice-tracker.aspx). A total of 20 ice trackers were air-deployed during the Leg 5 of the MOSAiC expedition. The trackers were deployed near the North Pole and drifted to the south through the Fram Strait. The buoy array formed by the trackers ranges from sub-kilometre scale to tens of kilometres and can be used to calculate the strain rates (and the deformation), as well as general ice drift parameters.