subroutine omthconv Read in parameters. Get a handle on the ODF OM Tracking History Data Auxiliary File. Determine datamode from keyword in primary header. Get a handle on the tracking history data binary table extension. Get start and end of exposure time stamps (OBT) from the ODF Non-Periodic Housekeeping File Convert Onboard start/end Timestamps (OBT) to event time tags (elapsed seconds since mission reference time 1998-01-01T00:00:00) using OAL_obtToTimeTag call Create and get handle on output event list file. Write required keywords from Tracking History primary header to output file primary header. Create and get a handle on RATES extension. Write attributes Write RATEn columns Free up memory and pointers. Release handles on data. end subroutine omthconv