Thank you all very much. I understand the difference now.

"John R. Copeland" wrote in message
...

"Eddie" wrote in message
.. .
Snowbird wrote:

Exactly. You need an IFR GPS which is WAAS capable and a glideslope
to fly a VNAV or LPV approach.


And, those are two very different types of glideslopes, from an
equippage
standpoint.


and because of that we should all start using the term 'vertical
guidance' -
a glideslope is part of an ILS



I suppose the term "glideslope" will persist in the future as a generic
term.
Even the Pilot/Controller Glossary with the AIM doesn't restrict it to ILS.
It mentions the ILS glideslope as just one example of "vertical guidance
for aircraft during approach and landing".
---JRC---