GPS altitude again is close to actual

Ron Lee writes:

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.

None of the augmentation systems are part of GPS.

It worries me that I see a lot of ignorance of GPS in the aviation
community. It is not surprising given the newness of the technology,
but it is worrisome because people often rush to embrace a new
technology because of the gee-whiz factor, long before they understand
the technology and its limitations. It's like people who drive off a
pier into a river because they don't realize that GPS can be
dramatically incorrect in urban environments.

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