A QGIS reader pointed me to a Sep 2019 US Forest Service report, <https://www.fs.fed.us/database/gps/mtdcrept/accuracy/index.htm>, which compares the accuracy of various GPS instruments.
Their Garmin eTrex 30 section stated that the eTrex's accuracy was ~ 3X poorer when using GPS+GLONASS instead of GPS-only mode. This seemed rather counter-intuitive. I checked using my eTrex 20 by taking 38 measurements distributed over an 8 hour period at a precisely known location, half using GPS only and half using GPS+GLONASS modes. Canopy type probably "Light-Medium". The results indicate that GPS+GLONASS does increase the accuracy, albeit only by a modest amount. It most certainly does not decrease it! A plot of my results on a 1 meter grid, along with descriptive statistics, can be downloaded (69 KB) from: <http://www.Mason-NH.org/Specials/GARMIN±GLONASS_TESTS.pdf> Cordially, -- Garth Fletcher _______________________________________________ Qgis-user mailing list [email protected] List info: https://lists.osgeo.org/mailman/listinfo/qgis-user Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user
