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OSBM Bolt: Hurst Castle, Transfer Bolt 
Hurst Castle Transfer Bolt on Hurst Castle [3GL]; OSBM TRANSFER BOLT ON ROOF OF BLDG.
Location
Grid reference: SZ 3187 8973.
Landranger 196: The Solent & The Isle of Wight, Southampton & Portsmouth.
Structure: Other.
Waypoint: OS0078.
Neighbouring Flush Brackets
The nearest fundamental bench mark is Freshwater,
4.41km to the southeast.
Third Geodetic Levelling, England & Wales (1950-68)
This bench mark was used during the Third geodetic levelling, England & Wales. It was included on the Brockenhurst to Freshwater (IOW) levelling line. The surveyor's description was Hurst Castle Transfer Bolt on Hurst Castle.
Location
Grid reference: SZ 3187 8973.
Landranger 196: The Solent & The Isle of Wight, Southampton & Portsmouth.
Structure: Other.
Waypoint: OS0078.
Neighbouring Flush Brackets
| S0545 | Hurst Castle, Pump House 151.33m to the north. |
| G4020 | Freshwater 2.31km to the southeast. |
| G4021 | Freshwater, School 3.46km to the southeast. |
| S0597 | Yarmouth, Church 3.58km to the east. |
| G4019 | Milford on Sea, The Garden House 3.62km to the northwest. |
Third Geodetic Levelling, England & Wales (1950-68)
This bench mark was used during the Third geodetic levelling, England & Wales. It was included on the Brockenhurst to Freshwater (IOW) levelling line. The surveyor's description was Hurst Castle Transfer Bolt on Hurst Castle.
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