On 4/5/07, Joseph Gray <[EMAIL PROTECTED]> wrote: > Am I correct in assuming that the position given by a WAAS enabled handheld > GPS unit is more accurate than the position reported by my Z3801? > Specifically, I tried a Garmin eTrex Legend Cx with WAAS enabled and used > averaging mode for the waypoint. > > On a related question, the eTrex reported that the position was +- 6ft. Is > that really 6ft, or is that 6ft in addition to the 3M claimed accuracy of > WAAS?
NAVSTAR is specified to provide some minimum level of precision and accuracy; if you get better than that, lucky you. If you find that 95% of navigation solutions are within a 2m sphere when WAAS is being used, lucky you. But 6ft is quite reasonable with a decent receiver and good visibility - I have a receiver on top of an office building, and roughly 50% of my solutions were within 1m, 95% within 2m. http://www.navcen.uscg.gov/gps/geninfo/2001SPSPerformanceStandardFINAL.pdf http://gps.faa.gov/Library/Data/waas/2892bC2a.pdf http://www.usace.army.mil/publications/eng-manuals/em1110-1-1003/toc.htm -- GDB has a 'break' feature; why doesn't it have 'fix' too? _______________________________________________ time-nuts mailing list [email protected] https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
