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OSBM Bolt 
OSBM Bolt in rock [3GL].
Location
Grid reference: NC 8685 0147.
Landranger 17: Helmsdale & Strath of Kildonan.
Structure: Rock outcrop.
Waypoint: OS1959.
Neighbouring Flush Brackets
The nearest fundamental bench mark is Tain,
21.34km 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 8685 0147.
Landranger 17: Helmsdale & Strath of Kildonan.
Structure: Rock outcrop.
Waypoint: OS1959.
Neighbouring Flush Brackets
| G2021 | Uppat Lodge 1.38km to the east. |
| G4372 | Doll, Daisy Cottage 2.32km to the northeast. |
| G2022 | Golspie Bridge 2.96km to the west. |
| G2023 | Golspie, Heavitree 4.24km to the southwest. |
| G2020 | Brora, Railway Station 4.62km to the northeast. |
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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