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OSBM Bolt 
OSBM Bolt in rock.
Location
Grid reference: NC 5540 3232.
Landranger 16: Lairg & Loch Shin, Loch Naver.
Structure: Rock outcrop.
Waypoint: OS1726.
Neighbouring Flush Brackets
The nearest fundamental bench mark is Loch Naver,
14.17km 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 5540 3232.
Landranger 16: Lairg & Loch Shin, Loch Naver.
Structure: Rock outcrop.
Waypoint: OS1726.
Neighbouring Flush Brackets
| G2060 | Altnaharra 3.52km to the northeast. |
| G2059 | Crask Inn 8.16km 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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