if you're looking for a more authoritative source than anonymous posters, here's a snippet from Honeywell (about 9100HT , I can only speculate if the same applies to their other systems, but my guess is yes it does
)
After deselecting a satellite on the ground for the FDE test, is this satellite only deselected for
the test or is it also deselected for navigation?
It is also deselected for navigation. The system requires a way for the pilot to also deselect a
satellite that is bad. Therefore, if the pilot is aware of a bad satellite (e.g. from NOTAM
reports) then the pilot would enter the bad satellite number in 5L. The satellite will then not
be used for the FDE check and it will also not be used in flight for navigation.
http://www.honeywell.com/sites/servl...1-08B58C468A08