GMT Online Services gives access to four sets of documentation:

1. GMT Technical Reference and Cookbook.
   • HTML Format
   • Portable Document Format (PDF)
2. GMT Tutorial.
   • HTML Format
   • Portable Document Format (PDF)
3. GMT Manual Pages.
   • HTML Format
   • Portable Document Format (PDF)
4. GMT Supplemental Manual Pages.
   • HTML Format
   • Portable Document Format (PDF)