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OSBM Bolt 
OSBM Bolt on living rock [3GL]; OSBM BOLT ROCK 6.0M NE SIDE RD PRODN WALL 4.0M SW JUNC.
Location
Grid reference: NC 5823 0528.
Landranger 16: Lairg & Loch Shin, Loch Naver.
Structure: Rock outcrop.
Waypoint: OS2021.
Neighbouring Flush Brackets
The nearest fundamental bench mark is Lairg (1946),
2.20km to the northwest.
Third Geodetic Levelling, Scotland (1956-68)
This bench mark was used during the Third geodetic levelling, Scotland. It was included on the Lairg to Tain levelling line. The surveyor's description was OSBM Bolt on living rock.
Location
Grid reference: NC 5823 0528.
Landranger 16: Lairg & Loch Shin, Loch Naver.
Structure: Rock outcrop.
Waypoint: OS2021.
Neighbouring Flush Brackets
| G1921 | Lairg, Bridge End House 750.00m to the north. |
| G1849 | Lairg, Sutherland Arms Hotel 1.08km to the north. |
| G1850 | Lairg, Station 1.37km to the south. |
| G1920 | Claonel 1.73km to the southwest. |
| G1851 | Achinduich 5.35km 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 Tain levelling line. The surveyor's description was OSBM Bolt on living rock.
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