RAIM errors and the Apollo GPS

Rich wrote in
:

What version of system software do you have?
Version 3.5 is the latest, and was issued to correct an overly
cautious RAIM prediction model in the earlier versions.

Since getting mine updated (a year or more ago) I rarely get a RAIM
warning.

We've been getting RAIM errors in Southern and Central California
with our GX60 in the past couple of months. The unit recovers in a
minute or so and there doesn't seem to be a pattern (e.g. in a turn,
special altitudes) to the failures. Yes, I know about the earlier
discussions of RAIM error and the GX** but it seems like the
frequency is increasing dramatically.

I too have noticed a lot of them lately on my GX60. Some of this has
been out in New Mexico and I have tended to discount them for that
reason, even though they were outside of any NOTAM'd hours for trouble.

I am not running the latest software, partly because UPSAT never told me
that it existed, and partly because I am annoyed with them anyway (long
story).
jmk