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OSBM Bolt 
OSBM Bolt on concrete surround of cattle grid, W corner, NE side of road [3GL]; OSBM BOLT NE SIDE RD W ANG CATTLE GRID.
Location
Grid reference: TF 5533 7037.
Landranger 122: Skegness & Horncastle.
Structure: Concrete block.
Waypoint: OS0091.
Neighbouring Flush Brackets
The nearest fundamental bench mark is Thornham,
32.92km 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 Boston to Immingham levelling line. The surveyor's description was OSBM Bolt on concrete surround of cattle grid, W corner, NE side of road.
Location
Grid reference: TF 5533 7037.
Landranger 122: Skegness & Horncastle.
Structure: Concrete block.
Waypoint: OS0091.
Neighbouring Flush Brackets
| G4680 | Ingoldmells, Ace of Clubs 1.57km to the southeast. |
| S0616 | Chapel St Leonards, Church 1.66km to the north. |
| S0617 | Ingoldmells 1.71km to the southeast. |
| G4681 | Hogsthorpe 2.55km to the northwest. |
| G4679 | Ingoldmells 3.03km 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 Boston to Immingham levelling line. The surveyor's description was OSBM Bolt on concrete surround of cattle grid, W corner, NE side of road.
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