Re: Y2K Problem....

Steve Walter (
Sat, 2 Jan 1999 04:53:35 -0500

Mike --

Thanks for your blurb.

The GPS rollover may affect more than ground-based GPS units.  As a pilot,
I certainly would not want to be airborne and navigating with a (pre-1994)
unit when that transition occurs ...

My experience with similar satellite clock "deficiencies" is that these
problems are related to the rollover only.  Once their system starts
ticking again on the other side of zero (and any rollover problems are
cleared up) -- the event itself becomes transparent and a non-issue.  This
"problem" has occurred many times on many different spacecraft.

As an example, the CGRO satellite should have NO Y2k problems (we hope),
but there is a coincidental rollover of its ephemeris-processing clock on
December 22, 1999 (2^28 seconds after Shuttle deployment) -- MUCH more
critical than perceived Y2k bugs, but ONLY because it's the evening prior
to a 4-day XMas work break.  I expect we'll have to pay close attention to
systems at that point -- and briefly put science operations on hold -- but
simulators don't indicate anything that can't be handled ... [hopefully
these aren't famous last words ...]

Steve Walter

>	MSNBC news web page had a article today on
>the upcoming dates of when Y2K problems will surface.
>One date in particular stood out:
>Full story is at
>41.087N  80.722W 330 meters
>Mike DiMuzio