My software says it can't compute a position due to missing nav file(s)?

We no longer supply a navigation file for each site.  We instead ask the user to download the global navigation or broadcast file.  This global nav file can be used for any site around the globe since it contains all broadcast messages for the entire 24 hour period.  You can rename the file if your software requires that the Obs file and Nav file have the same 4 character site designation.