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OSBM Bolt 
OSBM Bolt in rock [3GL]; OSBM BOLT ROCK NW SIDE RD 10.1M NE PRODN WALL.
Location
Grid reference: NC 4651 0147.
Landranger 16: Lairg & Loch Shin, Loch Naver.
Structure: Rock outcrop.
Waypoint: OS2015.
Neighbouring Flush Brackets
The nearest fundamental bench mark is Lairg (1946),
12.29km 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 Ledmore to Lairg levelling line. The surveyor's description was OSBM Bolt in rock.
Location
Grid reference: NC 4651 0147.
Landranger 16: Lairg & Loch Shin, Loch Naver.
Structure: Rock outcrop.
Waypoint: OS2015.
Neighbouring Flush Brackets
| G1917 | Invercassley, West Lodge 1.15km to the northeast. |
| G1918 | The Firs 1.82km to the east. |
| G1919 | Achuirghill 2.78km to the east. |
| G1886 | Oykel Bridge 7.95km to the west. |
| G1885 | Oykel, School/Post Office 9.47km 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 Ledmore to Lairg levelling line. The surveyor's description was OSBM Bolt in rock.
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