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LNAV, VNAV and LPV
Is there a formal discussion of these various approach minimums? I
looked through all the obvious places (AIM, GPS manuals, AOPA articles), but I haven't found a comprehensive discussion of these. Example: My understanding of LNAV/VNAV is that it has a barometrically generated glideslope. That would mean that any GPS with LNAV functionality should be able to generate a glideslope if it has an appropriate altimeter functionality. However, LNAV/VNAV is only discussed in the context of WAAS (AIM 5-4-5(e)) . If the glideslope is purely barometric, why does one need WAAS for LNAV/VNAV? Only a few places spell out what LPV is, but I finally figured out that it stands for Localizer Precision Vertical Navigation. Perhaps LPVNAV might have been a better acronym. In any case, I am assuming that the altitude in LPV is generated from WAAS, hence it is not prone to altimeter errors. Finally, if I have the GNS-430, what options do I have to enable these features? Does the installation need to be recertified, or is it simply a firmware upgrade? Any explanations or pointers to other articles would be appreciated. |
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