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OSBM Bolt 
OSBM Bolt in rock.
Location
Grid reference: NC 5213 2594.
Landranger 16: Lairg & Loch Shin, Loch Naver.
Structure: Rock outcrop.
Waypoint: OS1721.
Neighbouring Flush Brackets
The nearest fundamental bench mark is Lairg (1950),
19.00km to the south.
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 5213 2594.
Landranger 16: Lairg & Loch Shin, Loch Naver.
Structure: Rock outcrop.
Waypoint: OS1721.
Neighbouring Flush Brackets
| G2059 | Crask Inn 1.23km to the south. |
| S7766 | Fiag Bridge 7.72km to the southwest. |
| G2060 | Altnaharra 10.68km 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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