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OSBM Bolt 
OSBM Bolt in rock [3GL].
Location
Grid reference: NC 3993 0090.
Landranger 16: Lairg & Loch Shin, Loch Naver.
Structure: Rock outcrop.
Waypoint: OS2010.
Neighbouring Flush Brackets
The nearest fundamental bench mark is Lairg (1946),
18.54km 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 Ledmore to Lairg levelling line. The surveyor's description was OSBM Bolt in rock.
Location
Grid reference: NC 3993 0090.
Landranger 16: Lairg & Loch Shin, Loch Naver.
Structure: Rock outcrop.
Waypoint: OS2010.
Neighbouring Flush Brackets
| G1886 | Oykel Bridge 1.35km to the west. |
| G1885 | Oykel, School/Post Office 2.92km to the west. |
| G1884 | Lubcroy 4.61km to the west. |
| G1917 | Invercassley, West Lodge 7.52km to the east. |
| G1918 | The Firs 8.42km 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 Ledmore to Lairg levelling line. The surveyor's description was OSBM Bolt in rock.
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