This filter can be used to check internal data structures for validity. The output of the filter is identical to the input, but if corruption is found a fatal error will be issued.
Check for empty input.
This option will cause a fatal error if there are no waypoints, no route waypoints and no track waypoints, i.e. the reader didn't produce anything.
Output debug messages instead of possibly issuing a fatal error.
This option will output verbose messages reporting the state of the internal data structures holding waypoints, routes and tracks. Detected problems will normally produce a fatal error, but with this option in effect no error will be thrown allowing continued processing.