Medium resolution vector polygon seamask for areas south of 60S - VERSION 7.9

A medium resolution seamask for regions south of 60 degS, comprised of a roundel polygon with all land and ice shelves erased. Medium resolution versions of ADD data are suitable for scales smaller than 1:1,000,000, although certain regions will appear more detailed than others due to variable data availability and coastline characteristics.Data compiled, managed and distributed by the Mapping and Geographic Information Centre and the UK Polar Data Centre, British Antarctic Survey on behalf of the Scientific Committee on Antarctic Research.