David Megginson writes: > > Jim Wilson wrote: > > > I wonder if this could be incorporated (or interfaced) to the current waypoint > > management code. And, for the pilots on the list, do some GPS units also > > calculate elevations to plug in for VNAV operation, fuel estimation, etc? > > Every GPS I've seen does elevations, but the elevation information is only > just becoming legal for vertical guidance in specially-designated > approaches, and only when supplemented by WAAS.
This is because GPS positioning is *NOT* acurate with out a ground based signal to augment it ! http://www.ualberta.ca/~norris/gps/DOPnontech.html http://www.pobonline.com/CDA/ArticleInformation/features/BNP__Features__Item/0,2338,72407,00.html Note that VDOP is worse then HDOP Cheers Norman _______________________________________________ Flightgear-devel mailing list [EMAIL PROTECTED] http://mail.flightgear.org/mailman/listinfo/flightgear-devel
