Thomas Borchert wrote:
Robert,

tests and/or usage of ground-based jamming equipment.

As the people at Schriever AFB have explained to me, uploads of data
(each satellite has to be "touched" by the ground station at least
once
per day - talk about maintenance intensive) do NOT disrupt service.
Also, it is not really possible to deny service to well defined
geographic areas by switching off satellites.

--
Thomas Borchert (EDDH)

I guess whether or not a disruption may occur would depend upon what
the definition of 'service' is. If it includes the 'availability of
integrity to conduct an approach' then:

There are cases where a satellite taken OTS, can affect availability of
integrity using standalone GPS (RAIM) as well as cases where
availability of integrity using WAAS is not guaranteed.

As 'GPS' is sometimes used as an umbrella term, it wasn't clear from
the original post whether the NOTAMs referred to, were GPS NOTAMs or
perhaps WAAS NOTAMs as the latter can contain the UNREL contraction.


Regards,
Jon