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OSBM Bolt 
OSBM Bolt in rock.
Location
Grid reference: NC 5727 3460.
Landranger 16: Lairg & Loch Shin, Loch Naver.
Structure: Rock outcrop.
Waypoint: OS1728.
Neighbouring Flush Brackets
The nearest fundamental bench mark is Loch Naver,
11.48km 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 5727 3460.
Landranger 16: Lairg & Loch Shin, Loch Naver.
Structure: Rock outcrop.
Waypoint: OS1728.
Neighbouring Flush Brackets
| G2060 | Altnaharra 1.08km to the northwest. |
| G2059 | Crask Inn 11.00km to the southwest. |
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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