Comments on: Evaluating GPS Receiver Accuracy With VisualGPS http://freegeographytools.com/2009/evaluating-gps-receiver-accuracy-with-visualgps Exploring the world of free tools for GIS, GPS, Google Earth, neogeography, and more. Fri, 20 Apr 2012 04:10:35 +0000 hourly 1 http://wordpress.org/?v=3.3.2 By: Leszek Pawlowicz http://freegeographytools.com/2009/evaluating-gps-receiver-accuracy-with-visualgps/comment-page-1#comment-1494 Leszek Pawlowicz Tue, 04 Aug 2009 21:58:05 +0000 http://freegeographytools.com/?p=3981#comment-1494 I compared results from this Garmin unit with the antenna in both horizontal and vertical positions; no difference. Newer 60 and 76-series Garmin units use the MTK chipset, the same maker as in the Holux M-1000 unit, so that might explain the improved performance you see. I compared results from this Garmin unit with the antenna in both horizontal and vertical positions; no difference.

Newer 60 and 76-series Garmin units use the MTK chipset, the same maker as in the Holux M-1000 unit, so that might explain the improved performance you see.

]]> By: Bernie Connors http://freegeographytools.com/2009/evaluating-gps-receiver-accuracy-with-visualgps/comment-page-1#comment-1493 Bernie Connors Tue, 04 Aug 2009 12:54:59 +0000 http://freegeographytools.com/?p=3981#comment-1493 I have done similar tests with Garmin units but I always used a ceramic coffee cup to hold the unit in the upright position if it had a helical antenna. I found that the newer 76 and 60 series Garmin units had very little drift during my tests. I also used a benchmark that had been surveyed by GPS. I am certain it shouldn't be difficult to find a high order benchmark in your area. I have done similar tests with Garmin units but I always used a ceramic coffee cup to hold the unit in the upright position if it had a helical antenna. I found that the newer 76 and 60 series Garmin units had very little drift during my tests. I also used a benchmark that had been surveyed by GPS. I am certain it shouldn’t be difficult to find a high order benchmark in your area.

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