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Marine 1km Inshore Grid
1km grid of inshore areas for aggregating marine point source data -
3 nautical mile buffer of St Helena
3 nautical mile buffer (5.55km) of St Helena Island (SH-GIS-25/1990) -
12 nautical mile buffer of St Helena
12 nautical mile buffer (22.22km) of St Helena Island (SH-GIS-25/1990)