> You're not going to find a (publically-accessible) physical location which has better location error than 1m or so.
That was the kind of conclusion that I was coming to. There's the meridian line at Greenwich, but that only gives one coordinate. It's a pity that they don't have a crosshair with a published position. I think that the only way forward may be to get hold of another accurate GPS device and compare results. Unfortunately, the others tend to be quite expensive. Trimble have a cheap deice called the Catalyst, but you still have to buy their correction service at £300 per month. If I did have such a device I could to my local trig points, get accurate positions and publish them. I could use those data to test and calibrate my "budget" solution. Regards Simon > >
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