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OSBM Bolt 
OSBM Bolt on living rock.
Location
Grid reference: NC 5804 3557.
Landranger 16: Lairg & Loch Shin, Loch Naver.
Structure: Rock outcrop.
Waypoint: OS1729.
Neighbouring Flush Brackets
The nearest fundamental bench mark is Loch Naver,
10.40km to the east.
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 on living rock.
Location
Grid reference: NC 5804 3557.
Landranger 16: Lairg & Loch Shin, Loch Naver.
Structure: Rock outcrop.
Waypoint: OS1729.
Neighbouring Flush Brackets
| G2060 | Altnaharra 1.26km to the west. |
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 on living rock.
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