Notes about the GPN 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 GPN file type is primarily associated with 'GlidePlan' by GlidePlan Inc.. GlidePlan is pre-flight cross country planning software for the glider pilot. This is a text file containing a pointer to an associated .JPG file of an FAA aviation sectional map used for VFR navigation. The file also contains information needed to generate custom graphic overlays and markups produced by the GlidePlan application. These markups are used by cross country glider pilots to explore and plan possible flights.