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OSBM Bolt 
OSBM Bolt in rock.
Location
Grid reference: NC 5781 1199.
Landranger 16: Lairg & Loch Shin, Loch Naver.
Structure: Rock outcrop.
Waypoint: OS1710.
Neighbouring Flush Brackets
The nearest fundamental bench mark is Lairg (1950),
4.39km to the south.
Third Geodetic Levelling, Scotland (1956-68)
This bench mark was used during the Third geodetic levelling, Scotland. It was included on the Lairg to Loch Naver levelling line. The surveyor's description was OSBM Bolt in rock.
Location
Grid reference: NC 5781 1199.
Landranger 16: Lairg & Loch Shin, Loch Naver.
Structure: Rock outcrop.
Waypoint: OS1710.
Neighbouring Flush Brackets
| S7768 | Colaboll ? 2.49km to the southwest. |
| G1849 | Lairg, Sutherland Arms Hotel 5.65km to the south. |
| S7767 | by West Shinness 5.95km to the northwest. |
| G1921 | Lairg, Bridge End House 5.99km to the south. |
| G1920 | Claonel 7.51km to the south. |
Third Geodetic Levelling, Scotland (1956-68)
This bench mark was used during the Third geodetic levelling, Scotland. It was included on the Lairg to Loch Naver levelling line. The surveyor's description was OSBM Bolt in rock.
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