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OSBM Bolt 
OSBM Bolt in rock.
Location
Grid reference: NC 6159 3690.
Landranger 16: Lairg & Loch Shin, Loch Naver.
Structure: Rock outcrop.
Waypoint: OS1732.
Neighbouring Flush Brackets
The nearest fundamental bench mark is Loch Naver,
6.61km 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 in rock.
Location
Grid reference: NC 6159 3690.
Landranger 16: Lairg & Loch Shin, Loch Naver.
Structure: Rock outcrop.
Waypoint: OS1732.
Neighbouring Flush Brackets
| G2060 | Altnaharra 4.99km to the west. |
| G2061 | Ceann-na-coille 7.49km to the northeast. |
| G2062 | by Woody Knowe 12.40km 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 Lairg to Loch Naver levelling line. The surveyor's description was OSBM Bolt in rock.
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