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OSBM Bolt 
OSBM Bolt in rock.
Location
Grid reference: NC 5531 1828.
Landranger 16: Lairg & Loch Shin, Loch Naver.
Structure: Rock outcrop.
Waypoint: OS1715.
Neighbouring Flush Brackets
The nearest fundamental bench mark is Lairg (1950),
10.81km 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 5531 1828.
Landranger 16: Lairg & Loch Shin, Loch Naver.
Structure: Rock outcrop.
Waypoint: OS1715.
Neighbouring Flush Brackets
| S7767 | by West Shinness 3.85km to the southwest. |
| G2059 | Crask Inn 7.09km to the northwest. |
| S7768 | Colaboll ? 7.89km to the south. |
| S7766 | Fiag Bridge 8.85km to the west. |
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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