There are a few available directives to describe general traits of the file being described and not specific data within the file itself.
This is the description of the file format being described. This text appears in the help screens and in menus used by the various GUI wrappers.
Describes the character set used by this format. The value given must be one listed by 'gpsbabel -l'. example:
ENCODING UTF-8 # Use UTF-8 for input and output.
This value specifies the GPS datum to be used on read or write. Valid values for this option are listed in Appendix A, Supported Datums.
DATUM European 1950