Orekit (as of v9.3) supports RINEX (measurement/observation files) versions 2.x and 3.x. But the support for loading navigation files (Eg: ftp://cddis.nasa.gov/gnss/data/daily/2019/035/19n/brdc0350.19n.Z) is lacking. The RINEX data format document (ftp://igs.org/pub/data/format/rinex301.pdf ) discusses the format of navigation file broadcasted.

Similar to SEM/YUMA parsers, the support to run GPSPropagator at the end of loading RINEX navigation files can be made available.