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OSBM Bolt 
OSBM Bolt in rock.
Location
Grid reference: NC 5427 2037.
Landranger 16: Lairg & Loch Shin, Loch Naver.
Structure: Rock outcrop.
Waypoint: OS1717.
Neighbouring Flush Brackets
The nearest fundamental bench mark is Lairg (1950),
13.07km 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 5427 2037.
Landranger 16: Lairg & Loch Shin, Loch Naver.
Structure: Rock outcrop.
Waypoint: OS1717.
Neighbouring Flush Brackets
| G2059 | Crask Inn 4.76km to the northwest. |
| S7767 | by West Shinness 5.26km to the south. |
| S7766 | Fiag Bridge 7.55km to the west. |
| S7768 | Colaboll ? 10.09km 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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