Originally Posted by
nhluhr
Well, you're partially right. WAAS signals only come from geostationary satellites. On a Garmin unit, the geostationary satellites are anything with a number over 32.
This should be obvious, but since WAAS is only available from geostationary satellites, your GPS accuracy will typically be really crappy on north-facing slopes that shield your receiver from a clear view of the equatorial orbit.
WAAS, (Wide Area Augmentation System), is not part of NAVSTAR. It's an enhancement funded and operated by the FAA. NAVSTAR is funded my the U.S. taxpayers and operated by the U.S. Air Force 50th Space Wind at Schriever Air Force Base near Colorado Springs.