Mxsmanic wrote:
Dave Doe writes:

What is WAAS or RAIM etc etc - any aviation GPS technology - without GPS
itself?

WAAS is a navigation technology that relies on GPS. It is not _part_ of GPS.

Wrong again.

WAAS is a subsystem of GPS that transmits localized GPS correction
information for the US via a pair of geosynchronous satellites.

WAAS merely provides one more signal among the many that make up the
GPS system.

It's very useful for lateral position in many circumstances, even for
aviation. The altitude data is too unreliable to be useful for aviation.

Wrong again.

With WAAS corrections, the maximum lateral and vertical error is 7.6 m
under all cicumstances, makeing it more than reliable enough to make
vertically-guided landing approaches in IFR.

WAAS LPVs

http://www.faa.gov/about/office_org/...ches/index.cfm

--
Jim Pennino

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