This format can...
read and write waypoints
The format we call gpsutil is a simple file format used by a program that runs on POSIX- compliant OSes like UNIX and Linux. Reads and writes of this format are very reliable. (The lead developer of GPSBabel also contributed to this that 'gpsutil' the early days.)
Note that 'gpsutil' is a different format - and program - than the one called GPS Utility; for that one, you should probably use our PCX module.