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OSBM Bolt 
OSBM Bolt on culvert.
Location
Grid reference: NC 5699 1528.
Landranger 16: Lairg & Loch Shin, Loch Naver.
Structure: Culvert.
Waypoint: OS1713.
Neighbouring Flush Brackets
The nearest fundamental bench mark is Lairg (1950),
7.64km 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 culvert.
Location
Grid reference: NC 5699 1528.
Landranger 16: Lairg & Loch Shin, Loch Naver.
Structure: Culvert.
Waypoint: OS1713.
Neighbouring Flush Brackets
| S7767 | by West Shinness 4.12km to the west. |
| S7768 | Colaboll ? 4.99km to the south. |
| G1849 | Lairg, Sutherland Arms Hotel 9.01km to the south. |
| G1921 | Lairg, Bridge End House 9.34km to the south. |
| G2059 | Crask Inn 10.52km 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 culvert.
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