DCW-GMT: The Digital Chart of the World for GMT

The Digital Chart of the World is a comprehensive 1:1,000,000 scale vector basemap of the world. The charts were designed to meet the needs of pilots and air crews in medium- and low-altitude en route navigation and to support military operational planning, intelligence briefings, and other needs. For basic background information about DCW, see the Wikipedia entry. DCW-GMT is an enhancement to DCW in a few ways: It contains more state boundaries (the largest 8 countries, Norway and United Kingdom are now represented). The data have been reformatted to save space and are distributed as a single deflated netCDF-4 file.