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OSBM Bolt 
OSBM Bolt in rock [3GL]; OSBM BOLT ROCK 139.3M W FENCE JUNC S SIDE RD.
Location
Grid reference: NC 8542 0136.
Landranger 17: Helmsdale & Strath of Kildonan.
Structure: Rock outcrop.
Waypoint: OS1960.
Neighbouring Flush Brackets
The nearest fundamental bench mark is Tain,
20.44km to the southwest.
Third Geodetic Levelling, Scotland (1956-68)
This bench mark was used during the Third geodetic levelling, Scotland. It was included on the Helmsdale to Tain levelling line. The surveyor's description was OSBM Bolt in rock.
Location
Grid reference: NC 8542 0136.
Landranger 17: Helmsdale & Strath of Kildonan.
Structure: Rock outcrop.
Waypoint: OS1960.
Neighbouring Flush Brackets
| G2022 | Golspie Bridge 1.60km to the southwest. |
| G2021 | Uppat Lodge 2.79km to the east. |
| G2023 | Golspie, Heavitree 2.92km to the southwest. |
| G4372 | Doll, Daisy Cottage 3.63km to the northeast. |
| G2025 | Smithy House (A9) 4.44km to the southwest. |
Third Geodetic Levelling, Scotland (1956-68)
This bench mark was used during the Third geodetic levelling, Scotland. It was included on the Helmsdale to Tain levelling line. The surveyor's description was OSBM Bolt in rock.
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