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CDS Surveys acquire new Leica Viva GNSS GPS units, with Leica smartnett licences. This means we can work at full precision in ordinance survey grid and levels. Leica smartnett is enabled by the network of ordinance survey base stations, which delivers corrections at millimetre level. Ordinance survey coordinates and levels are vital to survey flood risks, and sea defences. This system is used by all authorities.