On Thu, April 5, 2007 19:06, Joseph Gray said: > 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?
Yes, IF you have decent reception for the handheld. You do not want a bad multipathenvironment. > Specifically, I tried a Garmin eTrex Legend Cx with WAAS enabled and used > averaging mode for the waypoint. Try logging the positions to a PDA or normal computer. Look at the values. How much do they wander? Compare with the positions from the Oncore in the GPSDO. This will give you a much better understanding or "feeling" of the quality of the solutions. Can you split the GPSDO signal and reradiate to the Garmin? > 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? With a good antenna (&antenna siting) it is not hard to get an accuracy of a few meters. You might approach that even with unaided GPS. But using a highsensitivity receiver in marginal conditions (inside buildings etc) - even if you get a fix, it will not be super accurate. Like in so many other applications - add problems in one stage, and the downstream results will suffer! _______________________________________________ time-nuts mailing list [email protected] https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
