GPS altitude again is close to actual

"Roger (K8RI)" wrote:
WAAS isn't part of GPS.

That comment may be helpful in a GPS newsgroup where the technology is
discussed in the absence of any application, however, in an aviation
newsgroup, discussions of GPS are primarily about the application, and in
that context WAAS is inseparable from GPS; in other words, in aviation
there is no application for WAAS independent GPS AFAIK. So, your above
claim is extremely off-topic, at best.

Neil

Actually he is correct. WAAS is not part of GPS. You don't need WAAS
to use GPS for aviation.

True but my GPS says WAAS enabled.


Ron Lee

Do you know of an aviation use of WAAS that isn't tied to GPS? That is the
issue.

I've never heard of any.
As we use it you can use GPS withoug WAAS , but not WAAS without GPS.
IOW it's an augmentation system.

Exactly, it is an augmentation system developed for and funded by the
FAA. The notion that WAAS is part of GPS is like saying that NDGPS or
CORS or any other separate systems that use or work with GPS are GPS
systems.

Of course WAAS cannot be used without GPS since it corrects GPS
signals and provides an integrity function. WAAS is worthless without
GPS but the converse is not the case.

Ron Lee