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I think the whole WAAS thing is in flux. The AIM gets wordier and more
difficult to interpret with each change to its discussion of GPS. IMHO, until there are a whole lot of WAAS capable boxes flying in the system we will be flailing about in the dark. Did you see the change to the AIM with regard to a reversed W on approach plates? Doesn't create much confidence in the system. Bob Gardner "Tarver Engineering" wrote in message ... "Bob Gardner" wrote in message news:R0hcc.78998$K91.171081@attbi_s02... You're right. AIM 1-1-20(a)(8) tells us that we should not use GPS altitude. When WAAS is in common use this will probably change. The altitude error is part of the WGS-84 model and is not a WAAS issue any longer. The CNX-80 provides VNAV capability through the use of pressure altitude from a transponder source and the pilot's baro correction input; married to a partial TAWS data base. GPS/WAAS is not likely to become an acceptable substitute for pressure altitude. Larger airplanes use air data derived pressure altitude in conjunction with GPS for improved RNP capability. |
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