I stand by what I wrote two years ago: New Post: November Librem 5 update: Byzantium Released - #36 by irvinewade
That tells you that the GNSS chip is working (or not).
Obviously it would be helpful if you already know your approximate latitude and longitude so that you can confirm that the valid data (as reported by the GNSS chip) is also correct. It of course should be correct but if you want to make sure that “it works” then that would be a sensible part of validation.
Until you are confident that your GNSS chip is working, it is not worth worrying about any software that layers on top of it.