> You'll need a GPS receiver with the capability of outputting carrier phase data (u-blox receivers will do this) and ideally a well-characterised external antenna (these are quite expensive).
That's very useful. Thanks. I am indeed using a uBlox device as my base station. I ran it for 48 hours and got accuracy to maybe half a metre, but I haven't tried post-processing thedata. However, that still leaves the fundamental problem: I can (and will) publish the kit of parts for making your own base station. You could use something similar to build a rover or you could buy one off the shelf. According to the ads this will give you an accuracy of 2 cm, but how will you check that you really are getting that accuracy? That question was the driver for my original posting. Regards, Simon
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