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OSBM Bolt 
OSBM Bolt in rock.
Location
Grid reference: NC 6370 3848.
Landranger 16: Lairg & Loch Shin, Loch Naver.
Structure: Rock outcrop.
Waypoint: OS1734.
Neighbouring Flush Brackets
The nearest fundamental bench mark is Loch Naver,
4.15km to the east.
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 6370 3848.
Landranger 16: Lairg & Loch Shin, Loch Naver.
Structure: Rock outcrop.
Waypoint: OS1734.
Neighbouring Flush Brackets
| G2061 | Ceann-na-coille 4.89km to the northeast. |
| G2060 | Altnaharra 7.51km to the southwest. |
| G2062 | by Woody Knowe 9.81km to the northeast. |
| G2063 | Rough Haugh 12.54km 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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