GMT Mailing Lists

Two electronic mailing lists are available for users to subscribe to.
  1. provides a forum for GMT users to exchange ideas and ask questions about GMT usage, installation, portability, etc. Please use this utility rather than sending questions directly to us; you are much more likely to get a speedy reply.
  2. is a one-way street for us to notify users when a new version has been released. No user can post to this list. Please subscribe to this list if you ONLY want email when a new version is available.
Note: Please do not report bugs to the mailing lists; instead see the GMT 4 Bugs page.

To add yourself to these mailinglist (maintained by the listserv program), send email to with a one-line message. E.g., if your name is John Smith then send

subscribe gmt-help John Smith

Listserv automatically obtains your email address. To unsubscribe, send

signoff gmt-help

instead. The same procedure is used for gmt-group.

To browse previously posted messages to gmt-help, please visit the official GMT 4 Mailing List Archive. gmt-help is also available as a read-only netnews group via NNTP as gis.gmtlist at server

Occasionally, a frustrated new GMT user will convince him/herself that their work is of paramount importance and hence they feel justified in digging up our phone numbers and calling us directly to get personal attention to their vexing problem. Please don't even think about doing this unless you are prepared to pay our standard consulting fee of USD 300 per hour and endure insults that would make hardened C-programmers blush...