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OSBM Bolt 
OSBM Bolt in rock.
Location
Grid reference: NC 5239 2437.
Landranger 16: Lairg & Loch Shin, Loch Naver.
Structure: Rock outcrop.
Waypoint: OS1720.
Neighbouring Flush Brackets
The nearest fundamental bench mark is Lairg (1950),
17.42km 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 5239 2437.
Landranger 16: Lairg & Loch Shin, Loch Naver.
Structure: Rock outcrop.
Waypoint: OS1720.
Neighbouring Flush Brackets
| G2059 | Crask Inn 370.00m to the north. |
| S7766 | Fiag Bridge 6.90km to the southwest. |
| S7767 | by West Shinness 9.08km 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.
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