"Morgans" wrote in message ...

"Blueskies" wrote

It has to have the additional WAAS avionics goodies. Simple GPS needs the
backup.


You are picking nits. WASS *IS* GPS, MAN!

You said you could not use GPS alone for IFR. Yes you can, GPS with the
WAAS is STILL GPS!
--
Jim in NC



What is GPS without WAAS enhanced avionics then? WAAS does not do anything by itself, but GPS does. It is the additional
error checking that WAAS uplinks to the avionics etc that makes it redundant and therefore capable of stand alone
operation... good discussion