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OSBM Bolt 
OSBM Bolt in rock.
Location
Grid reference: NC 5424 2966.
Landranger 16: Lairg & Loch Shin, Loch Naver.
Structure: Rock outcrop.
Waypoint: OS1724.
Neighbouring Flush Brackets
The nearest fundamental bench mark is Loch Naver,
16.57km 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 5424 2966.
Landranger 16: Lairg & Loch Shin, Loch Naver.
Structure: Rock outcrop.
Waypoint: OS1724.
Neighbouring Flush Brackets
| G2059 | Crask Inn 5.26km to the south. |
| G2060 | Altnaharra 6.42km to the northeast. |
| S7766 | Fiag Bridge 11.91km 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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