This package contains gshhs which you can use to extract shoreline polygons from the Global Self-consistent Hierarchical High-resolution Shorelines (GSHHS) available separately from NGDC or the GSHHS home page (GSHHS is the polygon data base from which the GMT coastlines derive). It also contains gshhs_dp for cleverly decimating a shoreline, and gshhstograss to convert shoreline segments to the GRASS database format. The package is maintained by Paul Wessel.