English: GPS Survey Equipment at Weir Dyke Bridge. Photo taken at Weir Dyke bridge
172000. The gear belonged to a group checking water levels in nearby drains who had established a datum on the bridge using GPS (8 satellites) and this gave me an opportunity to check my Etrex, which uses 4 satellites, against their professional equipment. The difference was less than 1m - my Etrex was showing 20ft accuracy at the time. For another picture see
336893.
This image was taken from the
Geograph project collection. See
this photograph's page on the Geograph website for the photographer's contact details. The copyright on this image is owned by David Wright and is licensed for reuse under the
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== {{int:filedesc}} == {{Information |description={{en|1=GPS Survey Equipment at Weir Dyke Bridge Photo taken at Weir Dyke bridge
172000. The gear belonged to a group checking water levels in nearby drains who had established a datum on the bridge usi
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