Notes about the GTM file extension:
Incorrect file associations could be the result of underlying issues within your PC system. As such it is highly recommended to scan your PC for invalid registry entries, unused processes and other unfavourable system settings to identify slowdown issues.
The GTM file type is primarily associated with 'GPS TrackMaker' by Geo Studio Technologies Ltd.. The file format has the extension .GTM (initials for GPS TrackMaker) and stores all Waypoints, Tracklogs and Routes as well as information related to the screen display, background and grid color, Waypoint text, User-defined text, etc. Digitized images are also included in the .GTM file.