Free vector and raster map data at 1:10m, 1:50m, and 1:110m scales Bathymetry Nested polygons for each depth created from SRTM Plus. [drain file 56 show nev_download] [drain file 44 show nev_download] [drain file 47 show nev_download] [drain file 45 show nev_download] [drain file 48 show nev_download] [drain file 49 show nev_download] [drain file 50 show nev_download] [drain file 51 show nev_downl