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OSBM Bolt 
OSBM Bolt in rock.
Location
Grid reference: NC 5317 2692.
Landranger 16: Lairg & Loch Shin, Loch Naver.
Structure: Rock outcrop.
Waypoint: OS1722.
Neighbouring Flush Brackets
The nearest fundamental bench mark is Loch Naver,
19.09km 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 5317 2692.
Landranger 16: Lairg & Loch Shin, Loch Naver.
Structure: Rock outcrop.
Waypoint: OS1722.
Neighbouring Flush Brackets
| G2059 | Crask Inn 2.32km to the south. |
| S7766 | Fiag Bridge 9.15km to the southwest. |
| G2060 | Altnaharra 9.36km to the north. |
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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