Calbourne Fundamental Bench Mark 

Location
Grid reference: SZ 4255 8657.
Landranger 196: The Solent & The Isle of Wight, Southampton & Portsmouth.
GPS network passive station: H1SZ4286.
Waypoint: FM7170.
Neighbouring Flush Brackets
| S0601 | Calbourne 126.49m to the north. |
| G4415 | Roseland Cottage 1.21km to the north. |
| G4420 | Westover Farm 1.31km to the west. |
| G4419 | Brook Cottages 2.90km to the west. |
| G4414 | Corf Barn 3.12km to the north. |
Third Geodetic Levelling, England & Wales (1950-68)
This fundamental bench mark was used during the Third geodetic levelling, England & Wales, and was levelled with a height of 213.7871 feet [65.1623 metres] above mean sea level (Newlyn datum). It was included on the Freshwater (IOW) to Calbourne (IOW) and Totton to Calbourne (IOW) levelling lines.
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