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OSBM Bolt 
OSBM Bolt on boulder.
Location
Grid reference: NC 5749 1059.
Landranger 16: Lairg & Loch Shin, Loch Naver.
Structure: Boulder.
Waypoint: OS1709.
Neighbouring Flush Brackets
The nearest fundamental bench mark is Lairg (1950),
2.96km 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 on boulder.
Location
Grid reference: NC 5749 1059.
Landranger 16: Lairg & Loch Shin, Loch Naver.
Structure: Boulder.
Waypoint: OS1709.
Neighbouring Flush Brackets
| S7768 | Colaboll ? 1.61km to the west. |
| G1849 | Lairg, Sutherland Arms Hotel 4.30km to the south. |
| G1921 | Lairg, Bridge End House 4.62km to the south. |
| G1920 | Claonel 6.08km to the south. |
| S7767 | by West Shinness 6.60km to the northwest. |
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 on boulder.
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