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OSBM Bolt 
OSBM Bolt in rock.
Location
Grid reference: NC 5946 3551.
Landranger 16: Lairg & Loch Shin, Loch Naver.
Structure: Rock outcrop.
Waypoint: OS1730.
Neighbouring Flush Brackets
The nearest fundamental bench mark is Loch Naver,
9.11km 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.
Location
Grid reference: NC 5946 3551.
Landranger 16: Lairg & Loch Shin, Loch Naver.
Structure: Rock outcrop.
Waypoint: OS1730.
Neighbouring Flush Brackets
| G2060 | Altnaharra 2.68km to the west. |
| G2061 | Ceann-na-coille 10.03km 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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