Before satellites, mapping was carried out by the Ordnance Survey using a method known as triangulation. This involved concrete triangulation (or trig for short) points being set up on high spots all over the country. This one is on the ramparts of the Roman Camp. From here, the surveyors would have been able to see several other trig points and measure the bearings from one to another and from trig points to other places, the whole being transcribed onto paper to produce maps.
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