Photograph Notes: Photo taken at Weir Dyke bridge [[172000]]. The signpost in the background marks the footpath along the bank of the New River Ancholme. The Surveyor was with a group checking water levels in nearby drains. He 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 his professional equipment. The difference was less than 1m - my Etrex was showing 20ft accuracy at the time. For a close-up of the survey gear see [[336908]].
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